i mean what is the difference between air brakes and vacuum brakes. also tell me the types of electrical braking systems in an electric locomotives.
Locomotives can adjust the polarity in their electric drive motors for braking.
air brakes supply air to push a piston to apply the brakes,these are double systems with fail safe mod to increase force up to 20% vacuum systems used up to 1970 used vacuum to pull the piston but only worked at 14.7 psi ,atmospheric pressure so everything had to be much larger and heavier to increase efficiency electopneumatic uses electricity to control the brakes so they can all come on at the same time instead of sequentially as in the air only system dynamic braking is where the drive motor become generators that create torque at the drive wheels to slow the train,the power generated is turned to heat and discharged by fans,not all engines have this system
