Included for your railroad is a mod to more accurately represent the heavyweight Pullmans of the 1910s-1930s, as well as the Palace Cars of the late 19th century.
The majority of these cars were built, owned, and operated by The Pullman Company; and this mod includes 7" Pullman lettering, done from the original Pullman tracing; more
appropriate marker lamps; and appropriate name boxes.
I find that "<scale=1.5><size=50>MAITLAND" works well on the Palace cars; or <scale=1.75><size=50>McGIRTH works well for the single word names, such as on the 12-1s, which are 4.5" figures.
For longer names, I have done something like <scale=2.5><size=44>LAKE  MOREAU. The longest names, such as <<scale=1.35><size=50>CLOVER  PASTURE or <scale=1.75><size=50>LAKE  PEARLaw
All cars have a "Pullman Name" tick box that uses Lego's Livery pack to add naming options. They also have A End and B End marker lights (even though these heavyweights originally had
a handbrake at either end).
Along with the Pullman operated cars, the dining car would generally be railroad operated, so one with Southern Railway style sill stripe and "name" box for the 'DINING CAR' text has been included; 
and as this is a shortline and no shortline is complete without a combine, I have done a matching railroad-owned/operated combine; after which point I figured I should finish the pack with a chair car,
using the Lego's Custom text box for "CHAIR CAR" lettering.
I have also done a wooden REA-Baggage car on the vanilla car, with Mail Storage option (since it has no catching hooks) and Pullman letterboard options for the wooden Pullman Palace Cars.
12-1: PULLMAN owned and operated
8-1-2: PULLMAN owned and operated
Dining Car: Railroad owned and operated
Observation Car: Either PULLMAN owned and operated or Railroad owned and operated
Baggage Car: REA/US Mail/Baggage Lettering Options
Combine: Railroad owned and operated
Chair Car: Railroad owned and operated
Palace Sleeper: PULLMAN owned and operated
Palace Observation Car: PULLMAN owned and operated or Railroad owned and operated
To be authentic, Pullman owned and operated cars were painted Pullman brown (which UPS adopted) until 1902, after which point "Pullman Green", actually a brown in itself, 
(a mixture of yellow, black, and either grey or red) took over as "Pullman Standard Body Color".
As lightweights came about, several roads (NYC, SP, SAL) adopted 2-tone grey schemes, leading The Pullman Company to create the "Pool Scheme" which comprised 2-tone grey.
After the 1948 divestiture Pullmans began to be painted in other schemes, but the "green" remained on a great many cars. This is what I have worked to recreate here.
These cars were owned by The Pullman Company, NOT the railroads, and barring a few exceptions, as such carried only Pullman lettering. By 1950 one could start to see railroad sub-lettering
as part of the divestiture (although cars were still leased, maintained, and operated by The Pullman Co.) in 2", 3", 4", or 5" on the ends. By the late 1950s and 1960s, railroad inspired
schemes had taken over, with Pullman in many cases relegated to the small sub-lettering on the end, with a train name or railroad name in the centre in the large lettering.
I personally use "#272608" to replicate the "70-10" colour used by Pullman, in later years this was DuPont D4558-A (with 1 part red) at other points it was Minnesota Paints 7030 Green.
Gold Leaf lettering was used until 1938, when DuPont Dulux lettering replaced it. In the final years One-Shot imitation gold was used.
I use "#92660C" to replicate the imitation gold; "#DAB465" for the Gold Leaf (in real life we have used Honda Odyysey Gold).
As for accuracy, it was common to see regional Southern Railway passenger trains with a Pullman or two on the rear, behind a light Pacific (Ps2, P1, P, etc.) and a combine or few coaches.
There were shortlines, such as into Tonopah that had through-Pullman service (usually one buffet-lounge-sleeper), from the "outside world" to fit your shortline.
In the 1960s and 1970s, Bear Creek Junction/Scenic RR on the Graham County line from Topton played host to a number of Pullmans collected by Jack and Dan Ferris. It is here that the famous Pullmanite
David Duncan got his start. Bear Creek had dining cars, 2 3521 Section-Lounge-Obs cars, 12-1s, and 6-3 all-room GLEN cars just to name a few.
This requires Lego's Logos and Decals Mods, Lego's Passenger Mods, and the Texas State Shops 'Generic' Heavyweights Mod.
Use at your own risk, I am unaware of this conflicting with any other items, but offer no gurantee. I never intended to release this, but someone suggested I should, so I shall work to do so, along
with the 'As Delivered' locomotives.