ABS and CSS rules apply when non-signaled DCS rules are substituted for ABS.

ABS and CSS rules apply when non-signaled DCS rules are substituted for ABS.

• A. False
• B. True
• C. Only with supervisor
• D. Only for passenger trains

Answer: (A)

The key idea is that signaling systems determine which rules you apply. ABS (Automatic Block Signal) rules govern operation where fixed block signals are in effect, and CSS (cab signal) rules apply when cab signals are active. If you substitute non-signaled DCS (Dynamic Cab Signaling) for ABS, you’re not using the fixed block or cab-signal framework in the same way. With non-signaled DCS, there are no active signals to follow, so ABS and CSS rules do not apply; you follow the DCS rules that govern that portion of the operation instead. That’s why the statement is false.

The key idea is that signaling systems determine which rules you apply. ABS (Automatic Block Signal) rules govern operation where fixed block signals are in effect, and CSS (cab signal) rules apply when cab signals are active. If you substitute non-signaled DCS (Dynamic Cab Signaling) for ABS, you’re not using the fixed block or cab-signal framework in the same way. With non-signaled DCS, there are no active signals to follow, so ABS and CSS rules do not apply; you follow the DCS rules that govern that portion of the operation instead. That’s why the statement is false.