Bay Area Rapid Transit (BART) Practice Exam 2026 - Free BART Practice Questions and Study Guide

After coupling an E car to a D car at the Y end, confirming that the end-door light is on is crucial because it indicates that the coupler has made proper contact and that the electrical connections between the two cars are functioning correctly. The end-door light serves as a visual confirmation that the connection is secure, enabling safe operations between the two railcars.

This step is critical for ensuring the safety of passengers as it verifies that the doors between the cars can be controlled properly, allowing for safe boarding and alighting. If the light does not illuminate, it may signal an electrical issue that could lead to potential hazards during transit.

While checking that all brakes are applied, monitoring the passenger area, and ensuring the train is clean are also important operational procedures, the immediate and necessary action after coupling is to confirm the functionality of the end-door light, prioritizing safety and the operational integrity of the train.