The "CRANKS" you refer to or hand brakes all cars freight and passenger as well as locomotives are required to be equipped with them. In some cases it may be a wheel, they come in many shapes and sizes.
They are designed to be used mainly to hold cars or units stationary after being left on a track. Units were never supposed to be "kicked" anywhere and stopped by the use of the hand brake, many have been.
Freight cars being switched and moving on their own momentum are stopped by the use of hand brakes every day of the year.
However, under emergency conditions they could be used to stop a rolling car or unit. that has started rolling on its own. They have been used just for that purpose many thousands of times.
The hand brake or brakes may not stop something real heavy that is moving if on a real steep grade. In other words the tonnage might have overpowered the available braking power of the cars or equipment, whether it is the air brakes or the mechanical brakes, on the grade.
That is often referred to as a runaway.
So now there are three distinctly different things that have refferred to in this thread.
1. The Communication Whistle.
2. The Emergency Brake Valve.
3. The Hand Operated Brake.
Redtail67
They are designed to be used mainly to hold cars or units stationary after being left on a track. Units were never supposed to be "kicked" anywhere and stopped by the use of the hand brake, many have been.
Freight cars being switched and moving on their own momentum are stopped by the use of hand brakes every day of the year.
However, under emergency conditions they could be used to stop a rolling car or unit. that has started rolling on its own. They have been used just for that purpose many thousands of times.
The hand brake or brakes may not stop something real heavy that is moving if on a real steep grade. In other words the tonnage might have overpowered the available braking power of the cars or equipment, whether it is the air brakes or the mechanical brakes, on the grade.
That is often referred to as a runaway.
So now there are three distinctly different things that have refferred to in this thread.
1. The Communication Whistle.
2. The Emergency Brake Valve.
3. The Hand Operated Brake.
Redtail67