Braking performance required for the railway vehicle is among the most important criterions in choosing type of the braking system. Two most common types of friction brakes used currently in railway vehicles are tread brake and disc brake.
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Once the train starts to slide, it is more likely that it will continue to do so. so, to sum it up: it is because of the weight of the whole train provides sufficient friction and steel-to-steel friction coefficient is also actually sufficient (not 'slippery' as i thought).
Each locomotive also has an independent brake system, which applies air brakes on the locomotive only. Independent brakes are not normally used during train operations, but are primarily used as a parking brake, sometimes in conjunction with the hand brake on the locomotive.
Why aren't subway trains aerodynamic? Speed and capacity are the main reasons. In terms of speed, a lot of it has to do with how frequently the train starts and stops, as well as the track conditions.
A train's automatic brake system is supplied with air from compressors located on each operating locomotive. The air is filtered, dried, compressed, and stored in the locomotive's main reservoirs. Air pressure in the main reservoirs is maintained between 130 and 140 psi.
To help the wheels stay on the track their shape is usually slightly conical. This means that the inside of the wheel has a larger circumference than the outside of the wheel. (They also have a flange, or raised edge, on the inner side to prevent the train from falling off the tracks.)
To help the wheels stay on the track their shape is usually slightly conical. This means that the inside of the wheel has a larger circumference than the outside of the wheel. (They also have a flange, or raised edge, on the inner side to prevent the train from falling off the tracks.)
a magnet on the track, when the train runs over the magnet it will warn the driver to stop; a transmission loop that tells the train the signal is red, this will trigger the train computer to apply the brake.
Before the air brake, railroad engineers would stop trains by cutting power, braking their locomotives and using the whistle to signal their brakemen. The brakemen would turn the brakes in one car and jump to the next to set the brakes there, and then to the next, etc.