Metropolitan Transportation Authority (MTA) Assistant Conductor Practice Test

What does a Controlled Signal communicate to train operators?

1. A stop indication monitored by the RTC

2. A route indication for switching tracks

3. A speed limit for the upcoming section

4. A warning for upcoming crossings

The correct answer is: A stop indication monitored by the RTC

A Controlled Signal communicates a stop indication monitored by the RTC (Rail Traffic Control). In rail systems, signals are essential for the safe management of train movements. A controlled signal specifically indicates to train operators whether they must stop or can proceed, and it is monitored by the RTC to ensure that the train's movement corresponds with the overall traffic management of the railway network. This signal is part of a hierarchy of indications designed to prevent accidents and ensure that trains run safely in accordance with operational protocols. When a controlled signal shows a stop indication, it means that there is a reason for the train to halt, which could be due to various factors such as an obstruction on the track or a need to wait for a signal to clear for safe passage. The centralization of this signal under the supervision of the RTC adds an additional layer of safety, as it allows for coordinated communication regarding train movements. In contrast, the other options pertain to different functions of signaling systems but do not accurately define the primary purpose of a Controlled Signal. Route indications and speed limits are communicated through different types of signals, while warnings for crossings are also classified separately and serve distinct operational needs.