Primary road on my late 40s themed layout is the Pennsylvania Railroad.
Secondary road is the Southern Railway for some interchange operations with the Pennsy.
I also have a Golden State passenger train where I drop off/pickup the through sleeper it shared with the Pennsy.
When I feel like it, I also run two special passenger trains that ran on Pennsy tracks in the late 40s:
- The Freedom Train.
- The Train of Tomorrow.