Well, I did some more testing, and noticed that the brake force appears to be too weak to slow the train down while on a downhill grade. In fact, I could apply 100% brakes, but the train would still accelerate. 
 
In any case, I am no longer sure that it's the engine which is to blame, but right now I don't have enough data to be able to tell what I might still have to tweak. 
 
Cheers, 
 
D.M. 
 
In omnia paratus
		 
		
		
		
		
		
		
		
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