At first you have to press P to raise the pantograph, then V to start motor-fan, then W to set up the reverser, then D (and A to decrease) to increase the speed. Also you may press Z. As you see this is standart complex of procedures. 
So is this in case with brakes. To release locomotive brake press "[" and train brake ";". 
I hope my english is understandable.
		 
		
		
		
		
		
		
		
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