like truck that have a brake chamber with a spring caged in it does trains have the same system emergency brakes?
No, no springs - just air or vacuum - or on electric stock and additional regenerative braking system. So TWO TDs for a correct answer - one about EMERGENCY not PARKING/STABLING brakes. Well done whoever you are.
No they don't.A train brakes work all with air.On a freight train the system is charged to 90 psi.There is 90 pounds of air on the brake pipe and the air tanks mounted on each car.They are separated with a control valve.When the engineer sets the brakes he removes air from the brake pipe through a small hole in the brake valve.That causes a pressure drop that opens the control valve.Each car has a reservoir tank that is divided into two parts.When the valve opens it lets air from the smaller part of the tank release air into the brake cylinder applying the brakes.When the pressure in the tank matches the brake pipe the control valve closes(called equalization).Now in an emergency brake application all the air gets dumped from the brake pipe.That is caused by a break in the brake pipe of some sort or the engineer going the the emergency portion of the brake valve(what we call big holing it).Big hole is a term that means the air is removed from the pipe through a larger hole in the brake valve than the service hole.That higher rate of air pressure drop makes the control valve sense that an emergency application is needed.When that happens it uses the air from the emergency side of the car mounted tank also to put more air pressure into the brake cylinders on each car. There's more to it(including different types of systems) but that's basically how train brakes work in the USA anyways.Kind of long winded to say there's no spring system like a truck uses huh?Oh well,i just thought you might like to know how train brakes work.
