@TheMrBlinx All stations the train passing has somebody, like station master, is watching everything ok. That's why the train operator salutes. We have good manners!
Kankai - Brake release, when you apply the brakes on a train the front of the train starts to brake first, and as the pressure in the air pipe travells down the train progressively all the brakes are applying the same braking force. Because the carriages are coupled and not rigid, just as the train stops the driver will release the brakes for a short time and then re apply them, so all the couplings stretch and the back of the train is braking, thus allowing a smooth brake application
Notch - With a train you can not apply full power to the electric motors from a stationary start. So each notch from Off to Full power alows a regulated amount of the electric to the motors, a bit like changing gears in a manual transmission car.