Instructions governing movement of trains over spring switches

Spring switches are indicated by signpost with letters "S.S."

Do not operate spring switches by hand until points are closed. Heavy springs are compressed when wheels force the switch points open. If handle of switchstand is released with springs compressed, the force in the spring will be transmitted to the trainman and may cause injury. If absolutely necessary to deviate from the above instructions, trainmen must exercise great care to keep away from the handle when it is being released.

Trailing movements may be made over spring switches without operating the switch by hand.