Bay Area Rapid Transit (BART) Practice Exam 2025 - Free BART Practice Questions and Study Guide

The correct action for a Train Operator (T/O) before coupling a single car into another is to slow down to 5 MPH. This speed is crucial as it allows for a controlled and safe coupling process. At 5 MPH, the likelihood of causing damage to the cars or injury to personnel is significantly reduced compared to higher speeds. It also gives the T/O ample time to react and make any necessary adjustments during the coupling procedure, ensuring that the coupling is successful and secure.

While the other options may seem relevant, they do not prioritize safety and proper protocol for the coupling process. Accelerating to 10 MPH would pose a risk of collision and damage. Checking the radio is important for communication, but it is not the immediate first action taken specifically for coupling. Ensuring all switches are aligned is a key step in overall train operation safety, but the immediate focus during coupling is on managing speed to ensure a safe connection between the cars.