Brake coaches

osq7

Confused
I have just been wondering about this.

I'm not sure about what these coaches do or where in the train they are supposed to go. I was looking at some Express formations the other day and saw that most trains had (a)the brake coach at the front (b)2 brake coaches (c)No brake coach at all.

BTW what's a GUV?

osq7
 
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