What is a critical reason for quickly replacing broken colored lenses on subway signals?

The primary reason for quickly replacing broken colored lenses on subway signals is to prevent misunderstanding of the signal by a motorman. Color-coded signals are crucial for the safe operation of trains, as they convey vital information about track conditions, speed limits, and the need to stop. If a colored lens is broken or missing, it can lead to confusion regarding the intended command of the signal, increasing the risk of accidents or unsafe operations. Ensuring that all signal lenses are intact helps maintain clear communication and safety standards on the transit system.

While maintaining aesthetic appeal and minimizing costs are considerations, they do not outweigh the critical safety concerns tied to the clarity and reliability of signaling information for train operators. Compliance with safety regulations is also important, but the immediate focus must be on preventing any misinterpretation of signals that could directly impact the safety of passengers and crew.