To establish a route on a push button machine, the Tower Operator should do which of the following?

To establish a route on a push button machine, it is essential to push the signal button associated with both the entrance and exit of the desired route. This ensures that the entire path is properly set up for the movement of a train or vehicle, which is crucial for maintaining safety and efficiency in operations.

By pressing both the entrance and exit signal buttons, the operator communicates to the system that the route from the starting position to the destination is cleared and ready for use. This action helps to prevent potential conflicts or misrouting that could occur if only one end of the route was activated or if the exit was neglected.

In the context of train operations, ensuring that both signals are correctly activated is vital for maintaining proper signaling integrity and avoiding accidents. Thus, selecting the button associated with both the entrance and exit accurately aligns with the required procedure for setting a safe and effective route.