A great example of how the car service rules were more honored in the breach. ACL to Chicago? P&LE to Minneapolis?? PRR to Montana??? Just goes to show, when the customer needs cars, any cars will do.
As I always chime in on this topic, the AAR found in surveys around 1950 that barely 2/3 of all loaded car movements were in accord with Car Service Rules. So there were plenty of exceptions -- but the majority of moves DID comply.
