What should all employees do when trains are passing?

When trains are passing, employees should watch for pantograph defects. This is important because the pantograph is the apparatus mounted on the roof of electric trains to collect power from overhead lines. Observing the pantograph while trains are in motion allows employees to identify any potential issues that could pose safety risks, such as improper contact with the overhead wire or physical damage to the pantograph system itself. Ensuring the pantograph is functioning correctly is crucial to maintaining safe train operations and preventing outages or accidents, thereby protecting both passengers and crew.

The other responses do not encompass the responsibility of actively monitoring critical components of the train while it is passing, which can directly impact operational safety. Ignoring passing trains could lead to missed observations of hazardous conditions. Conducting a safety check is a proactive measure, but it would typically occur when conditions permit rather than while observing trains in motion. Reporting delays focuses on event documentation and communication rather than the immediate task of inspecting train equipment. Each of these activities plays a role in overall operations, but monitoring pantographs during passing trains is specifically vital for ensuring ongoing safety in the rail system.