Let's consider a electromagnetic track brake that works by eddy
current as well as a skid brake (by the electromagnetic attraction
force between the brake and the track) and it is installed in every
bogie in a train.
Obviously, the EM brakes reduce the braking distance considerably at
high speed because at high speed, the adhesion factor of the wheels
decrease and therefore the braking force exerted by the wheels
decrease. However, the EM brakes work independently from the wheel
adhesion and give extra braking force.
However at low speed, how much braking distance can EM brakes
decrease? Is it a good idea to make it compulsary for all normal
speed rolling stocks, or at least the streetcars, to equip all bogies
with EM brakes?