The best source passenger train information is to get hold of a public time table, these can be found at swap meets and on ebay under collectibles. They provide information, on what types of cars were in the train (coachs,sleepers,dome,cafe,diner,lounges). There were also trains between Forrest and Streator IL,  Gary IN and Montpelier OH.
and commuter operations in Chicago.
Steam era used  class J (4-6-2) and P (4-6-4)
Diesels - E7 E8 PA1 GP7
Venders:

Kits

Branch line trains HO 12-1 and 14 sections pullmans for over night trains.
Brass Car sides HO and N
Union Staion Products HO and N (City of Kansas City)
Stan Rydarowicz call him (330) 799-5321.

R T R (ready to run)



John Nixion's photos & 1958 consists