MR: (Main Reservoir ):-
Details : The compressor on the locomotive charges the main reservoir with air at 125–140 psi (8.6–9.7 bar; 860–970 kPa). The train brakes are released by admitting air to the train pipe through the engineer's brake valve. A fully charged brake pipe is typically 70–90 psi (4.8–6.2 bar; 480–620 kPa) for freight trains and 110 psi (7.6 bar; 760 kPa) for passenger trains. The brakes are applied when the engineer moves the brake handle to the "service" position, which causes a reduction in pressure in the train pipe.
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BC :(Brake Cylinder):-
Brake unit also stores compressed air, but for the purpose of braking only.
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please wait...Translate to EnglishYo, listen up! So, there's this thing called Main Reservoir (MR) on a train. The dude in charge, aka the engineer, uses a compressor to fill it up with air at 125-140 psi. When the engineer wants to release the brakes, air gets into the train pipe through the brake valve. For freight trains, the brake pipe is usually around 70-90 psi and for passenger trains it's 110 psi. When the engineer pulls the brake handle to the "service" position, the pressure in the train pipe drops and the brakes get applied. Oh, and by the way, there's also something called Brake Cylinder (BC) that stores compressed air only for stopping the train.