When going in-between cars, where a locomotive is attached, for any reason, red zone or three step protection is required, regardless of blue flag protection.
Red zone or three step protection may only be requested verbally via radio, and must be acknowledged via radio by the engineer.
Release of the red zone or three step protections can only be obtained via radio.
The request and release, and the engineer’s response must include a unique identifier, such as the railroads name or initials, a train symbol or a job number.
Only the person requesting red zone or three step may release the red zone or three step protection.
No one can request red zone or three step for any other person, each individual is required to request it for themselves, and only that person may release their own red zone or three step protection.
When such protection is requested, the engineer must center the reverser, apply the independent brake, (locomotive brake) and place the generator field switch in the off position, to prevent movement of the train.
The term three point and three step is used mostly on Norac railroads, Red Zone on GCOR railroads, the procedures each railroad requires will be found in their respective time tables in the safety rules section.
The three points or three steps are of course the steps the engineer is required to follow before he or she can verbally acknowledge the request for protection.
The engineer may not disturb any of the three steps taken until the verbal release is given from all employees who requested such protection.
On my carrier, entering the red zone, (violating the plane of the car body) without red zone protection is an automatic 90 suspension for the ground person, and moving the train without a verbal release is an automatic 90 days for the engineer.