Situation–Reaction (Man falls off train from rear coach):\nWhile travelling by train, you notice a man from the coach behind yours fall off the train. What should you do immediately?

Introduction / Context:
Rail emergencies demand immediate, safe actions that involve the entire system. The alarm chain is provided exactly for on-board emergencies that require the train to halt to prevent loss of life.

Given Data / Assumptions:

• You witnessed a fall from a nearby coach.
• You are on a moving train.
• Alarm chain is accessible.

Concept / Approach:
Pulling the alarm chain signals an emergency, initiates a controlled stop, and enables coordinated assistance. Jumping off a moving train endangers you and may create multiple casualties. Waiting until the next station delays care. Shouting at the fallen person is futile and unsafe.

Step-by-Step Solution:
1) Pull the alarm chain immediately and inform coach staff/TTE about the incident and coach location.2) After the controlled stop, inform railway staff precisely where the person fell.3) Assist trained personnel; avoid track hazards.

Verification / Alternative check:
In some jurisdictions, alarm misuse is penalized—but emergencies like a fall clearly warrant activation; it is the quickest way to mobilize help.

Why Other Options Are Wrong:
Jumping off risks severe injury. Waiting for next station wastes golden minutes. Yelling offers no real aid.

Common Pitfalls:
Panicking; not providing clear details after the stop.

Final Answer:
Pull the alarm chain so the train stops and coordinated help can reach the fallen person.