(Click images to Enlarge)
The Bachmann On30 cars are close to the Uintah Railway's "modern" era railcars. They just need to be lowered. They are 29 Foot long in 55n3.
The Bachmann On30 gondolas and flats can be narrowed a scale foot to represent an earlier narrow gauge gondola. An hour is all that it takes to narrow a gondola or a flat car.
The Bachmann On30 stock car has no known prototype except Bachmann's large scale rendition using a standard gauge car. It will suffice.
The Passenger cars match later cars and can be lowered for the earlier era.
Bachmann On30 Freight Cars
Bachmann On30 Passenger Cars
The passenger cars go well with our high drivered 4-4-0.
The windows match this Pacific Coast Railway Coach. The cars become 40-1/2 feet in 55n3, a big improvement, the width is 8-1/2 feet to match the plan.
The Bachmann passenger cars are 10'-3" high in the body, most narrow gauge cars are about 9'-3". Standard gauge cars match the 10'-3" height of the Bachmann cars. That works for me.
Found these "On30" trucks on Shapeways that make lowering the Bachmann On30 cars easier. They come close to the Uintah trucks.
Were there 10'-3" high narrow gauge passenger cars? Mexican narrow gauge railroads had them in steel and wood.