RS stands for Road Switcher as in ALCO Models RS-1, RS-2, RS-3 ect, ect.
As a reporting mark on a railroad Car it stands for Roberval & Sugwnay Railroad.
Railroad Forums
scharnhorst wrote:RS stands for Road Switcher as in ALCO Models RS-1, RS-2, RS-3 etc.You are almost right - but in the context of LIRR/NY&A freight operations, it stands for... Road Switcher (Just not the Alco models, just the train symbol)