ClintClassic, what build are you using? I thought they had fixed that in TRS19 SP4, but I will have to go back and try it. I noticed it in the "Realistic Controls" Tutorial, but I thought I tried it after SP4 and it worked. But then I seemed to run into something similar in the "Dynamic Braking" tutorial, and I could not get the brakes off even with the "D" key. I could get it moving, but could not get any speed up, even going downhill with a loaded train. Finally it froze up on the first big curve and would go no further. I will go back and try those again, but it seemed to be an issue with those grey and red Southern Pacific Locos.
EDIT, but then, this is the TRS22 forum, so I am guessing it is not working in 22? Also, I am thinking that N3V are working so hard to get "New and Better" stuff out to sell, they don't have the staff or time to fix the inevitable problems such a strategy causes.