Metropolitan Transportation Authority (MTA) Assistant Conductor Practice Test

What is an Interlocking?

1. A method for shunting trains

2. A type of rail vehicle

3. A system of interconnected signals and appliances

4. A style of train operation

The correct answer is: A system of interconnected signals and appliances

An Interlocking refers to a sophisticated system of interconnected signals and appliances used in railway operations to control train movements and prevent accidents. This system ensures that signals are coordinated with track switches to maintain safety and efficiency on the railway. For instance, when a train approaches a crossing point, the interlocking system ensures that track switches are set correctly and that signals display the appropriate aspects for the train to proceed safely. This functionality is essential in complex railway networks where multiple routes and signals must work together seamlessly to manage the flow of trains. By automating the interactions between signals and switches, interlocking greatly reduces the risk of human error. Other options do not capture the fundamental role of interlocking; shunting trains involves moving them around yards and does not pertain to the signaling system. A type of rail vehicle would imply a specific mode of transport, which is unrelated to signal control. A style of train operation may suggest a general strategy but lacks the specific safety and coordination aspect that defines interlocking systems.