Negative track lead to track relay?

• A. Tc
• B. TcX
• C. Te
• D. Toh

Answer: (B)

Understanding how track relays are wired is key here. In railway signaling, the way the track leads are connected to the track relay can determine whether the relay energizes correctly when the track is occupied. The variant that specifies a negative track lead to the track relay explicitly defines that return path, ensuring the relay operates with the intended polarity and remains stable when the section is occupied. The other configurations don’t specify or rely on that negative-lead connection, so they wouldn’t guarantee the same correct energizing behavior. That’s why this particular variant, the one with the X suffix, is the correct choice.