What is one of the ways to pass a block signal at stop?

Passing a block signal at stop is a critical operation that must be performed with the utmost caution to ensure the safety of train operations. The correct answer involves utilizing the verbal form of a specific procedure, namely Part 241. This procedure is outlined in the rules to provide authorization for trains to proceed past a stop signal despite the apparent danger.

Using a verbal form of authorization ensures that there is clear and direct communication between the train crew and the dispatcher or signal control, providing an essential check on safety protocols. This method requires explicit acknowledgment from all parties involved, which supports situational awareness and promotes safety in procedures that might seem to go against standard operation protocols.

The other options, while related to train operations, do not specifically address the method required to pass a block signal at stop. "A-Card" refers to another form of communication or authorization that may not be relevant for this specific situation. Similarly, a "Train Order" can be another way to relay instructions but is not the primary method to authorize passing a stop signal; it is used in different contexts. Therefore, the verbal part 241 holds particular significance in this scenario as the correct process.