When applying blocking devices for TC movements or OOS tracks, which signals can be displayed?

When applying blocking devices for TC (Train Control) movements or Out of Service (OOS) tracks, the correct choice indicates that all signals can be displayed except those leading to Automatic Block Signals (ABS) or Direct Control Signals (DCS). This restriction is put in place to maintain the safety and integrity of the train control systems.

The rationale behind this is that signals leading to ABS or DCS could potentially mislead train operators into believing that it is safe to proceed onto a section of track that is actually blocked or out of service. By preventing these signals from being displayed, it reduces the risk of an accident occurring due to confusion about track status. Therefore, the presence of blocking devices should be accompanied by clear instructions regarding which signals can be shown to maintain operational safety and ensure that train crews are fully aware of the conditions of the track they are approaching.

This ensures that the goal of safe train operations is upheld when dealing with TC movements and OOS conditions, as displaying the appropriate signals prevents miscommunication and enhances safety protocols.