Final answer:
Trackmen should stop work and inform the supervisor if there are no emergency alarm boxes available to use during an emergency.
Step-by-step explanation:
If there are no emergency alarm boxes along a trackway, the correct action for trackmen to take would be to stop work and inform the supervisor. This course of action ensures that a coordinated effort can be made to address the situation, whether it is a mechanical issue, a medical emergency, or another form of hazardous condition.
This is akin to the procedure firefighters might take in systematic rescue operations, as they assess situations and report to superiors to receive instructions via two-way radios. The priority is always to ensure safety and communicating with a supervisor will ensure the correct procedures are followed and appropriate help is dispatched if necessary.