dieciduej wrote:Well that's a horse of a different color!&*@#!^!! And I just found similar info at http://books.google.com/books?id=pf5MAA ... ss&f=false... Okay! I admit to attempting to cheat using Google... (Hey, at least I learned something new).
They are to prevent the trolley contact from hitting the bridge structure if the is a dewirement. Also they are energized so that the streetcar can continue to move and not lose power.
They are common over railroad crossings. Thanks for the visual clarification, I was blinded my Jessica!
Seen behind the motorman on the inside wall of a PCC departing "Riverside" many years ago: "Pickpockets are on duty for your convenience."