Lightweight Observation Combine Passenger Cars
- Atlantic Coast Line (ACL) (1)
- Central of Georgia (CG) (1)
- Chesapeake & Ohio (C&O) (3)
- Chicago & Eastern Illinois (CEI) (2)
- Chicago & North Western (CNW) (3)
- Chicago, Burlington & Quincy (CBQ) (3)
- Denver & Rio Grande Western (D&RGW) (2)
- Erie Lackawanna (EL) (1)
- Florida East Coast (FEC) (1)
- Great Northern (GN) (1)
- Illinois Central (IC) (4)
- Kansas City Southern (KCS) (1)
- Missouri Pacific (MP) (1)
- Monon (MON) (1)
- Nashville, Chattanooga & St Louis (NC&StL) (1)
- New York Central (NYC) (2)
- New York, New Haven & Hartford (NH) (1)
- Norfolk & Western (N&W) (1)
- Pennsylvania Railroad (PRR) (2)
- Rock Island (RI/ROCK/CRIP) (4)
- Seaboard Air Line (SAL) (2)
- Southern Pacific (SP) (2)
- Southern Railway (SOU) (2)
- Union Pacific (UP) (3)
- Western Pacific (WP) (1)