One more thing: what can you tell us about your overall vision, or the overall concept for your layout?
Assume that even though I (as a non-American living across the pond) have heard about San Antonio (Texas, right - Alamo and all that?), I have never heard about rail traffic into and through the town of Yoakum.
It sounds from what you write like you want to model passenger traffic on a double track mainline through Yoakum, and industry switching along an industry line that runs between San Antonio and Yoakum.
What kind of passenger traffic do you want to model? Is Yoakum passenger wise a busy place, with passenger trains (maybe frequent commuter trains) arriving in opposite directions on both tracks at the same time pretty much constantly?
Or is Yoakum conceptually a fairly small town which sees one passing long distance passenger train stop once a day (or three days a week or whatever), with most of the traffic on the main being passing freights?
How important is the double track main to the look and feel of your layout?
In real life, double track is there to support busy traffic - one main being used for "up" traffic and one for "down" traffic (i.e. in the opposite direction), so trains in the opposite directions won't have to wait for each other in sidings.
But to
model the typical
traffic on a busy double track main - i.e. getting a
sequence of trains passing through a town in both directions tends to mean that you must set aside a lot of your layout space for extensive staging tracks.
Staging tracks are tracks where e.g. 4-5 different trains in both directions (a total of 8-10 trains) can wait before making their run.
So a layout meant to showcase a sequence of trains on a double track main (instead of just having one train circle endlessly on each of the two mains) tends to need quite a bit of staging space.
Taking a double track main down to a single track main with one or two passing sidings tends to make for more interesting mainline running for a model railroad - you now must coordinate trains meeting at the sidings, with one train going into the siding to let the other pass.
Makes mainline running take a lot longer time - i.e. better "play value" for our layouts. You now can get away with less staging, and each mainline train will spend a longer time going across the main, since there now is cause to stop at signals by sidings.
But it could be that the double track main is part of the look of the area, and should be modeled. Not a given that you have to run trains on both mains, though - you can always declare a section of one main closed for maintenance, and create a deliberate bottleneck for your trains.
Anyways - might be a good idea to describe (at least in rough terms) what kind of train traffic you imagine for a typical "day" on your layout.
What trains do you think will run? From where will they come, to where will they go? How will they interact?
Will a passing freight train be dropping off a block of cars for the local industries in a siding somewhere, and a local turn come out from a yard somewhere beyond the layout, pick up the inbound cars, go switch industries, drop off outbound cars in a siding to be picked up by another passing train later?
Will passenger trains be exchanging cars - will one passenger train e.g. drop off a restaurant car, which later will be added to another passing passenger train?
And so on and so forth - how do you visualize the way your trains will be running?
Doesn't have to be 100% prototypical or "realistic" - as per the Golden Rule ("he who pays the gold makes the rules") you can run trains any which way you like on your layout.
But thinking about how you want to run your trains and have your trains interact
may help focus the track plan design.
And by all means - feel free to apply the KISS principle - keep it simple at the start.
Only you can decide what your goal should be. No need to make up a super elaborate operating plan with staging and all kinds of things, if what you
really want to do is to be able to kick back in a comfy chair with a cool beverage in your hand, admiring a train or two running through your field of vision.
Enough verbiage - hope I didn't scare you into thinking that this
has to be done in an elaborate way and that you have to make a deep study of how real railroads operated to be able to build a model railroad layout.
It is supposed to be fun. If you are having fun, you are doing it the right way
Smile,
Stein