Final answer:
Moving the train's master controller handle to the ON position with the duplex gauge indicating 55 pounds will result in the train initiating movement, assuming all systems are operational and no safety interlocks are in place.
Step-by-step explanation:
When the master controller handle of a train is moved to an ON position, and the duplex gauge indicates 55 pounds, it typically refers to the pressure in the train's brake system. In most train systems, the indicated pressure represents the amount of air pressure available in the brake pipe. If the brakes are fully released, a 55-pound reading would normally imply that there is sufficient pressure to allow the train to move. Therefore, if the handle is engaged to the ON position under these conditions, the train would begin to initiate movement or acceleration if all other necessary systems are in order and there are no safety interlocks preventing movement.
In this scenario, the train's master controller handle is moved to the ON position when the duplex gauge black arrow indicates 55 pounds. When the handle is in the ON position, it means that the train's motor is activated, and the train is ready to move.
Therefore, when the master controller handle is moved to the ON position at 55 pounds indicated by the duplex gauge, the train will start moving.