AMTK
| Amtrak | 9 |
BO
| Baltimore & Ohio | 1 |
PRR
| Pennsylvania Railroad | 1 |
RBBX
| Ringling Bros. and Barnum and Bailey | 5 |
RBMN
| Reading Blue Mountain & Northern | 1 |
SRNJ
| Southern Railroad Company of New Jersey | 1 |
UP
| Union Pacific Railroad Company | 1 |
WAB
| Wabash | 1 |
WCRL
| West Chester Railroad Company | 1 |