Which code corresponds to train stop retaining wire; train stop clearing?

• A. Vj
• B. Vs
• C. Wp
• D. Wz

Answer: (A)

The concept being tested is how train stop circuits are coded. Each train stop wire and its function uses a two-character code: the first character shows the equipment family (V for the train stop circuit), and the second character differentiates the specific function. The suffix “j” marks the retaining function, while “s” marks the clearing function. So Vj identifies the retaining wire for the train stop, and Vs would identify the clearing action. Codes starting with W (such as Wp or Wz) refer to other functions or parts of the system and don’t describe the retaining/clearing of the train stop. Therefore, the code for the train stop retaining wire is Vj.