Not sure about that as I do not run quick drive from surveyor. be aware though that for an increase in speed the whole consist has to pass the speed board whilst reduction in speed occurs when the consist reaches the speed board.
I had a similar problem, but they should work regardless of how you get into Driver. I found that some rolling stock have limited speeds. Just to check, you are getting the speedboard from the track fly out?
I had a similar problem, but they should work regardless of how you get into Driver. I found that some rolling stock have limited speeds. Just to check, you are getting the speedboard from the track fly out?