Let’s Build a Paper Mill complex for a Friend

[TLOC]

A good friend is in the process of building a rather large HO scale layout. He had a space for a large industry and asked for some ideas. I had some but wasn’t ready until I sketched something out for myself to see if it would fit. Maybe a week later we were at a Ops session where there was a good sized paper mill and we were working it. Right before the 1/2 time lunch break he said, what do you think? I said paper mill and he said yep. On the ride home I showed him some sketches I had on my IpadPro and he said go ahead and design it. That was February 2025. Finally the area was in place where the now paper mill complex will reside in June/July.

I had no plans to create a thread on this but since I posted the thread on building a swing bridge I have a lot of asks to show the paper mill. So, here we are…

 

[migalyto]

This is going to be fun to watch!

Thanks for taking the time to do a thread and sharing it with us.

 

[TLOC]

I won’t get much into the layout beyond the spaces I have available but it’s a mushroom style layout design, there are 3 levels but no helix to connect them. He has a nolix that winds through a Peninsula 70’ long as it climbs the various levels. It’s interesting for sure

But above is the space for the paper mill complex. 24” deep and 32’ long to the right of the grey pillar. There is a now river scene with a swing bridge and girder approach bridges to the left of the pillar. That is in my Let’s build a swing bridge thread.

This is not going to be a step per step description of what happened and what is occurring now. Just some words (you know me, short & 2 the point) and some pictures. Nor will this be a piece by piece build of the structures but I will describe how we got to where I am writing about

Later

 

[TLOC]

This part is a narrative as most of the beginning paper sketches were photographed and added to a PDF to be texted over to my friend and a few others that became known as the “committee”. As the committee made suggestions those PDFs were deleted so no records. But based on paper mill knowledge gathered from being a road warrior for years in Wisconsin and the UP, I knew what I saw. I also got a few tours of the Mosinee Papers plant in Mosinee, Wi by good friend in a position he could take me places to not seen by regular tour groups. Anyway, the committee had 2 retired professional railroaders on it who made lots of suggestions. Some good advice and some ignored by the layout owner. This back and forg went on from basic alley time of “let build it” in February to now design it in July after the framing for the area was completed.

Basically the plan was to do facade buildings 2-4” deep staggered appropriately 28’ of the 32’ . They are representing the wood handling building, bleach, paper machine, finishing warehouse and the shipping department with an enclosed rail dock. 28’ piece a cake to fit. Actually it wasn’t. Designing the buildings sure was easy but tracks are needed to deliver or pick up and his minimum 30” radius for a mill was nice but bothersome to design around

In August I did paper mock ups painter taped to the back drop wall. The committee now was just the. 2 railroaders and layout owner. I went to Vancouver, Seattle and LA. Upon return nothing was the same. The 280’ long paper machine building the heart of a paper mill was 202’. The digester mock up 100’ tall was now 140’ tall and I didn’t bother measuring the revised recovery boiler building. So after a discussion with the layout owner we had revised the foot print we just didn’t know yet what it would be. This is now the end of September and the goal of operating the mill in May 2026 was unlikely.

So I did what I’m good at, research

 

[TLOC]

The owner wanted a representative model of a 1965 era Pacific Northwest paper mill. So online I went. I use story boards and project management tools in my modeling endeavors. So I cut and paste a lot in October for about 2 weeks. Finally on overload I went to Ai on 10/23 per my son’s suggestion.

I had gathered materials but you have to ask Ai the right ss questions to get a good answer. So my search for a PNW paper mill in 1965 led me to the Puget Sound area in 1965. Because the mill would be a representation of but not a prototype match there was leeway in the facts which will come up later

Remember I have a basis from online research prior to asking Ai for structure design help but let’s find a mill. I picked the Everett Washington area and Crown Zellerbach paper mills in Camas.

Ai: we’ll treat the Everett location as a representative, “Crown Zellerbach–style” Pacific Northwest paper mill, rather than a literal replica. That actually gives you more flexibility for layout design and storytelling while still grounding it in real 1960s regional industry.

Told Ai I wanted to production to flow left edge Wood handling building to right side shipping

The buildings:

• Wood Chip Unloading
• Pulp Mill / Digester Area
• Bleach Plant
• Paper Machine Building (202 ft)
• Finishing / Shipping Dock
• Power House or Boiler Room
• Engine House / Switcher Track

Missing is the a recovery building. Neither Ai or me are close to perfect.

Your Layout Orientation (Left-to-Right Flow)

From Ai
Following your described layout:
1. Left: Digesters and chip handling (newer steel-clad structures).
2. Center: Recovery building and power systems (tall, modernized, with visible stacks and pipes
3. Right: Paper Machine Building (older, long masonry base transitioning to metal, loading docks along the main track).
4. Far Right: Shipping area and boxcar loading tracks.

This left-to-right progression tells the mill’s story visually:
newest → transitional → oldest and most human-scaled.

So we have the production flow, so let’s design the structures.

Pacific Northwest Paper Mill – Circa 1965


(Interpretive Guide for Layout Operators)


This layout represents a Pacific Northwest paper mill in the mid■1960s—an era when


many mills were shifting from traditional batch operations to more efficient continuous


processes. The structures show a mix of post■war brick and 1950s–60s corrugated steel


construction, weathered by pulp dust, steam, and coastal rain.


Mill Flow Overview


1. Wood Handling Building – Logs arrive by rail and truck. Debarking drums and chippers
reduce them to wood chips, which are screened and conveyed to storage.
2. Digesters – Tall process towers where chemical and heat treatment convert wood chips
into pulp.
3. Bleach & Chemical Areas – Separate structures for refining and whitening pulp.
4. Paper Machine Building – The heart of the mill. Here the pulp becomes paper through
forming, pressing, and drying on massive rolls.
5. Kaolin & Additives Building – Supplies clay and starch additives to improve strength and finish
6. Recovery Building – Reclaims heat and process chemicals, reducing waste and fuel cost.
7. Power House – Provides steam and electricity for continuous mill operation.
8. Warehouse & Shipping – Finished rolls are wrapped and shipped by rail and truck to
printers and converters nationwide.

About the Era

By 1965, these mills were the economic backbone of many Northwest towns. They operated
around the clock, with family generations working side by side amid the constant rhythm of
conveyors, dryers, and locomotives switching cars at all hours.

What are we looking at from outside the complex fence

• From the road, a viewer sees a series of weathered industrial buildings — mostly corrugated metal, concrete block, and steam piping everywhere.
• The main mill building is tall and wide, with roof monitors and faint white vapor drifting upward from roof vents.
• Smokestacks (from the power and recovery boilers) rise behind it, occasionally releasing pale or gray plumes.
• Signs read “PNW Paper Co.” or similar, with smaller “No Trespassing / Authorized Personnel Only” placards on the fence.

Based on info I fed in Ai gave me individual renderings of structures. Some I asked to be summarized many renderings got deleted but we wanted grittier buildings that what we were getting but dimensionally based on 1965 era the sizes seems good

 

[TLOC]

Before I get into how I am designing the structures here is a Ai summary review

I don’t hide the fact I can get very analytical about how I put things together. What I have achieved with the help of Ai would have taken weeks if I detailed everything as Ai does. There is a binder that holds every question, answer, suggestions and nasty comments I had with Ai and detailed structure builds. It’s well over a 100 printed pages but thankfully it’s all PDFs that I can send to the layout owner

1965 Era Pacific Northwest Paper Mill Project Summary

Comprehensive structural, environmental, and design overview (Switchlist details omitted)

Project Overview

The 1965 PNW Paper Mill project is a historically grounded modeling effort recreating a mid-1960s
Great Northern–era paper mill and surrounding industrial environment in the Pacific Northwest. It
focuses on structural realism, atmospheric weathering, and authentic regional scenery.

Visual & Environmental Context

Era: circa 1965. Setting: industrial riverfront typical of western Washington or Oregon. Atmosphere:
damp, gray skies, mossy concrete, and heavily weathered materials. Perspective: from outside the
fence line, what a passerby would see from across the river or access road.

Structural & Construction Standards

Standard wall assembly uses .040 plain styrene laminated with Evergreen #9040 (CMU or siding
texture) using MEK or Tamiya Extra Thin, clamped 30–45 minutes. The Machine, Bleach, and Power
Plant buildings use this system. The Machine and Bleach Buildings also use the Styrene-on-Plywood

Laminate Method: 3/8-inch plywood base with styrene surface, Loctite Power Grab adhesive, and 1×2
or 1×3 stiffeners at 12–16-inch spacing.

Major Buildings & Layout Relationships

Machine Building: main production hall, 202’ long x 70’ high x 1” deep, centerpiece with roof venting and heavy
weathering. Bleach Building: connects directly to Machine Building (left side), same laminate method.

Power Plant: uses standard laminated wall system, tied by steam lines and tanks. Engine Facility:
single-stall engine shed, reference 'Rev9 visual', gravel/cinder trackage and oil stains.

Materials, Finish & Weathering

CMU block, corrugated steel, clapboard siding, and asphalt roofs. Muted gray and green palette, rust
streaks, and industrial wear typical of the 1960s PNW region. Ground: cinder/gravel mix with oil
patches and spillage. Environmental details include gutters, drums, and steam vents.

Scene Composition & Backdrop

Matte print backdrop planned with a painterly riverbank and gray-sky timberline for visual depth. Scaled
print-ready image scheduled for next daily image reset.

Documentation & Workflow

All tasks follow the Confirm → Format → Generate → Advance workflow. The baseline operational
document is 'PNW Paper Mill – Daily Switch List (1965, Great Northern Era) Rev.8' (layout reference
All building standards, dimensions, and visual references approved. Backdrop print queued. Next
phase: structure fabrication and scene testing.

Next Steps

1. Finalize scenic mockup (Bleach/Machine link). 2. Print and test-fit backdrop. 3. Begin fabrication with
lamination methods. 4. Prepare Test Session Plan 1 (car flow). 5. Detail pipes, conveyors, and
riverbank elements.


Papers of Wisconsin – PNW Paper Mill (1965 Project)
Prepared by: Tom OConnell | Revision Date: November 2025
Baseline Document: PNW Paper Mill – Daily Switch List (Rev.8

 

[TLOC]

So now we know the structures we need to represent a decent looking paper mill. But what are we shipping and why is that important? Every paper mill is different. In this 1965 era PNW paper mill a minimum of 560 tons of finished paper product will be shipped daily. Why is this important? I have the data but I won’t bore you with it. But basically the daily production goals determines everything if you work backwards from it as a modeler. That tells me how much pulp wood needs to be delivered and unloaded every day, how much pulp will be created then stored, right on down the process. It also tells you how many 50’ boxcars of the 1965 era are needed daily. 8!

This PNW mill will ship a minimum of 560 ton of finished paper products. The product is 80% Newsprint (remember this is 1965) and 20% speciality papers. Why speciality papers? It gives a better mix of needed chemicals both dry/liquid and it needs the additive Kaolin. More rail car movements and that is the goal. Yes, newsprint paper mills did produce other products so it’s realistic. Beside the owner has a few scratch built Kaolin boxcars he’s very proud of!

Let’s build a structure or better yet 2. The order of production is the Wood handling building, the digester, bleach and onto the paper machine building. The wood handling building is sometimes a separate structure from the digester and feeds the digester by conveyors between the buildings exposed to the elements. The owner is deciding how he wants this modeled. I favor some open space between the WH building and the digestors because we have a sweet backdrop that the gap in the buildings would expose. So I’ll show the Bleach and Paper Machine buildings as they are going to be 1 piece.

The bleach building will be 50’ high x 40’ wide, flat roof approximately 1-2” deep (owner has 2 tell me). Here is a few versions of Ai illustrations and why ChatGPT has become so frustrating

This was what I asked for. Put the buildings in order of production, colorize it and show the names of each building (almost)

Here I asked for the building in real inches, not bad but the warehouse got shorten up from the original dimensions. They should have been 80’ wide and 40’ high, to like 25’x50’ all on its own when I asked for a change to the heights. Also missing is the shipping department

Better after I readjusted the warehouse but now it’s higher than the Machine building. Also the WH building and digester are separated by a gap. These are frustrating but the work around is a separate project page for each building. More on that down the build…

But I have the dimensions I needed because I do mock ups. Those haven’t change just the illustrations

So, go grab some styrene, poster board and yellow cardstock.




NEXT we mock up

 

[TLOC]

I have a habit of deleting photographs of things I do such as weathering. For newer clients until I am used to what they want and to show them where I’m at I deleted them after approvals or suggestions. I did the same here and on the companion Swing Bridge thread.

The bleach building was figured at 60’ tall. The machine building is 70’ tall. So out came the older used yellow cardstock. Cut a shape 60’ HO scale high, cut out a 70’ tall piece to compare heights. Bleach is too tall to provide to my eye a good height separation. Trimmed it down to 50’ high.

Here is the side by side

I’m ok with this.

I had previously asked for an external view of the machine building based on some pictures online

It delivered this

Edit

Sorry about the bolden, it’s struck

tried everything even posting but don’t want to lose the above. Shutting down

NEXT

 

[TLOC]

No clue what happened up in the above post

What I like about this version of the Paper Machine

building is the 2 rows of windows, the overhead door, personnel door and the vents. So back to the Bleach building. I need a reference on the machine building to pull elements to line up. Example, I don’t want the highest level of windows to beblow the roof line of the bleach building.

So I cut out a strip of poster board, highlighted the edges and lined it up. Right at the roof line of the bleach building. Then measured down a separation to the next row of windows. The top row windows are 8’ tall with the bottom row 6’ tall. Cut out the overhead door and highlighted the edges for visual separation and did the same for a personnel door

To the bleach building I Added 5’ square vents, a personnel door 3 x 8 and a round 3’ circular vent and took the picture.

The yellow Machine building is representing 80’ of the 202’ long building to be. The bleach building is represented by a 50’ high x 40’ long sheet of .040 Evergreen plain sheet.

The buildings in 1965 were going through a moderiztion of the paper mill similar to what most mills were doing. Going from the old style batch digester systems to create a pulp slurry to the continuous pulp digesting using the Kamryn digester system. I have the link if interested. Supposedly though while the new digester was being build and buildings surrounding it. They upgraded the cladding of the machine buildings. They kept the masonry base from 6 to 12’ above ground level exposed but metal sheeted the rest.

The suggestion was to represent the CMU masonry which I understand we call blocks. Roughly 9” x 16” and common nowadays. I used a stand in my ever trusty white poster board. I cut it 10’ high and what is shown is 9’. Just over the 3’x 8’personnel door. I colored it with a graphite block to just highlite some texture

Here I just stood up what I’m working on. It’s at the layout with the owner deciding.

 

[TLOC]

I continue to mock up the paper mill

Added the wood handling building to the left edge. The gap will be filled by overhead pipe bridges and conveyors joining the white building representing a bleach building

Under the eaves are 2 louvred vents 4’x 5’ the white strip will be industrial steel framed windows 3’ x 30’ but the will be individual framed. The overhead door is 18’x 20’ I think. The personnel door is 3’x8’. There will be a utility door and pipes on the building to the right of the overhead door

This is JUST a height check. The digester tower is going to be 100’ tall after a few tests

The digester will be 100’ tall, I’m good with that. This 5” width is overwhelming as it’s too wide

3.75” works after a few other width tests

after a series of texts 3.5” was settled on for the width. The digester is next. It will be a full building compared to facades and the back wall of the digester will sit 1 inch in front of the gap between the wood handling building on the left and the bleach building to the right.

I drew up the 2 side walls for the digester building and was having math issues, asked Ai for help for 1st time today

It is a stepped tower

That’s it for tonight. An interesting day at the bench. I did get the couplers, wheel sets and truck frames weathered for the well cars on a stack train. Multi-tasking

 

[TLOC]

Ok I’m back. Completely forgot before dinner I took a picture of the mockup and pasted it to ChatGPT and asked for a sketch and color it. Here what it looks like

The paper machine building will continue on another 120’ to the right. Left out are my vents and a few personnel doors and made the digester building like a silo. Very frustrating

 

[TLOC]

All pictures posted today were taken 48” to 60” from the mockup in the aisle

The mock ups that were on the backer board are in position per previous visits and measurement

I only mocked up 80’ of the planned 202’ long Machine Building. But the previous 202’ poster board of the machine building was still taped to the wall. We were doing measurements last week, so let’s go from 202’ to 282’. BUT NO, friend asked where is the chip silo and storage building. My response you said just make it internally to the machine building. Let’s add a building! Ok!
Where is the wrap department? That is where they wrap newspaper rolls and add strapping to prevent unraveling. Inside the machine building in a voice of slight annoyance. So we added length to one building and added 2 more structures

Change up! Let’s wrap the small pillar with the warehouse and shipping department combo

It was decided to move the warehouse to behind the shipping department and wrap the pillar with it! DONE, Now the pillar is the warehouse in line instead of behind the shipping department which will be 180-200 feet long to the right of the pillar warehouse.

Above with the adjustments, and shifting the whole complex to the left we now have a 10” gap! So we left it. Choices are expand again the machine building or move the warehouse there. The pillar then becomes a part of the shipping department.

! Joy…

Now we wait, again!

 

[Michael B]

Watching this...

This is interesting to me, obviously.

Not trying to be a smart s, but...
Concrete blocks are "7 5/8 x "15 5/8.
Add in the mortar and you get 8 x 16.
Depth can be 4, 6, or 8 inches.
Entry doors are "36 wide, but only "80 high.

I admire you taking the time to research like that, maybe someday
I will try it.

One last thing - I have a thread on California HSR. There, you can find
their precast concrete facility. You should take a look at that...

 

[TLOC]

Well the chart didn’t go well, so I found it again and did a screen shot

 

[Guilford Railman]

Just getting caught up on this thread. This facility is going to look amazing when it’s completed! Will be following your progress.

 

[TLOC]

Just getting caught up on this thread. This facility is going to look amazing when it’s completed! Will be following your progress.

Thank you.

I’m sort of in a holding pattern and that has nothing to do with the air traffic controllers. Along with the owner we have tried projecting some switch lists to see how the mill would operate. Over 32’ of length and 2’ wide you’d think there would be no problem figuring out the track plan. Not so!

We need to iron out the unloading spots for both the dry and liquid chemicals. Additives like kaolin and sulfates and a few other spots. When he gets that figured out I can start building the facades. I am going to start the engine shed tomorrow minus the corrugated sidings and roof. When those come in I will laminate them to the .040 styrene siding and roof pieces. I have the approach bridges to document and post in the swing bridge thread. So that and leaving Wednesday for a road trip there will not be much happening here

 

[TLOC]

Update: Lots of texting between my friend and me. We are taking the far left building called the Wood Handling building and putting it as far right of the complex as we can go. Wood chips would be sent to the digester via a conveyer 15’ above ground.

This will free up the track congestion on the left side of the complex and allow for almost triple the size of the digester building and recovery building. He’s using his track design software to plot it out. I want to take flex track and push pin it in place! But it’s his layout

Meanwhile, I started the fiasco called the engine shed. I always measure multiple times before I cut anything even styrene. I never verified the size of the shed. The shed is too low and narrow. A switcher like the SW1200:is at its tallest point is 16’5” per Wikipedia so a 15’ high door opening won’t cut it.

So, I re-designed it and the picture above illustrates the difference. I’ll finish the walls this evening but I will not be able to apply the siding. I used the sheets I had on the original shed. That one’s not wasted though. Either it goes on my Wisconsin Interstate layout or it might appear elsewhere in this paper mill

 

[Rico]

Wow, so how did I miss all this, especially being a Papermill fan?!
I’ll be following!
The mill I’m doing suffers from extreme selective compression so I’m trying to squish in key elements where I can.

As for the shed, I had a very similar building that was also too low. My solution was to add a concrete foundation to raise it up a few feet.

 

[TLOC]

Wow, so how did I miss all this, especially being a Papermill fan?!
I’ll be following!
The mill I’m doing suffers from extreme selective compression so I’m trying to squish in key elements where I can.

As for the shed, I had a very similar building that was also too low. My solution was to add a concrete foundation to raise it up a few feet.

Since this is a 1965 era layout I researched how I should raise the building. CMU or concrete blocks, 36” to 48”. I couldn’t find any styrene sheets so I was going to scribe my own. That’s when I found the doorway is to tight. I could have managed it but decided it’s a good shed. There is a power plant just to the left of the paper mill and it may reside there. If not I have plenty of places on my own layout.

Thanks for checking in

 

[TLOC]

I have plenty to do while waiting for a new track plan. Then a text to review the facade after we move the wood handling building to the far right of the layout. So

We took away the wood handling building. The digester/recovery complex will become a separate build from the facade buildings shown here. This gave a bigger footprint for the

Chip storage and pulp screening stays at 8”x 8”
The bleach building becomes 8”w x 5” high
The stock prep building will be bigger at 10” w x 7.25”high
The machine building will still be 70’h (9.75”) x 280’ (38”)long

This will allow for better unloading spots in front of these buildings. If I remember right, this adds a total 7” width or long to the complex. I also discovered my white marker doesn’t erase on this black material

As you can see this mockup was placed behind my own paper mill yard lead. Unintentionally it also shows how big these buildings will be compared to the rail cars and locomotive on the track

Hopefully more Thursday. The day trip tomorrow that surprise takes me 1/2 mile off I94 to Hiawatha Hobbies where I have a list of need to buy items instead my usual 1 or 2. My PayPal account balance is going to take a hit. Styrene has shot up in price since my last big buy over a year ago. Most of this mill will be scratch built over the next 6 months. That’s just to get the bones of the buildings built, painted and appropriately weathered for 1965. Details like pipe racks, pipe bridges, storage tanks and piping will be a combined effort between the layout owner and 2 other buddies. They can play with those as I will work on the conveyors. But 1st the facade fronts of the 4 buildings shown above, the not shown wrap building, warehouse, the shipping department and enclosed rail dock.