A new update!
Been laying cork road bed and ran into a problem. But didn't figure it out until after I let the caulk set.
Since I was using woodland scenics foam inclines and risers, when I had an underpass to cut for a downhill loop I left a gap in the riser for the lower end to pass through.
Problem was, I forgot to line up my track centerline from one side to the other, and test fit my steel girder bridge from Atlas. Turns out that even if I had, I would have been cursing. That section really needs to continue the curve. I hoped I could cheat it. Nope.
So, order a curved bride? I wanted one there with the Great Northern logo, since this is the area of first attention when someone comes to view the layout. But, I could only find Kato steel girder bridges, and no logos on them. Drat.
Plan B
(Always be willing to make up a plan B... especially when you do things like I do).
Time to make my own bridge. Wood or stone? While wood is still around in the transition era (1950s/60s) it doesn't fit with my vision for this layout. And, I really want to get that roadbed problem fixed sooner, rather than have me learn how to build a wooden bridge to fit. I haven't made one before. So stone it is. Basically, a very short tunnel.
Whoot! I've got some WS tunnel portals on hand.
Hmm... plaster... Never painted plaster before. The instruction say to use their earth shades. No mention of priming nor sealing like I would with resin or plastic... Hmmmm... Not sure how to handle that. Due to the long reach on the front side, I'll need to paint them before installing them. Thoughts? Who paints plaster parts like this? How do you handle it? Primer? or washes and shades straight onto the plaster?
So, what did I do to make the bridge? First a test fit of the plaster fascia to see what I was working with for depth and height. Yep. They're about perfect. Once I had the tunnel portal gap marked, inside and outside, I cut away my nicely laid cork roadbed from each side of the gap. Measured down 1-inch, and carved an abutment/step for the new foam piece to sit on. Used a hacksaw blade for the basic cuts.
Follow up with lining the "inside" of the tunnel with scrap foam bits to make "walls" a bit wider than the portal opening. Basically, I wanted a smoothish surface for paint later.
Then, I found a scrap piece of 1-inch foam already cut to the width of the WS risers. Hotwire cutter and knife, and got the foam "bridge" piece installed. Let the glue set, then came in with plaster cloth. One side of the "bridge" is a tad low, but I can raise it with joint compound. It will take several layers, though.
Here's the finished bridge/tunnel (WS portal propped up just for the photo - I'll install after painting.):
Also, I was concerned about being a klutz and dropping the plaster portals, so I traced one on some foamcore and made a couple of proxies to use while working on the construction:
They're not perfect, but good enough to keep the sizing on track.
If you've installed those plaster portals before, please share your favorite techniques for painting and weathering them below. Thanks!