Which code identifies the train stop control stick relay?

• A. Vb
• B. Wp
• C. Vs
• D. Wg

Answer: (C)

In train signaling, relay codes use a two-letter convention: the first letter groups relays by the general function or subsystem, and the second letter specifies the particular device within that group. For the stop control system, the relay that handles the stop control stick is identified by a suffix that denotes “stick.” Thus, the code Vs fits this function: V places it in the stop/control family, and s indicates the stick variant. That’s why Vs is the correct code for the train stop control stick relay. The other codes refer to different relays within the same interlocking system and do not denote the stop control stick.