It seems that on the few loco's that I've used (Horseshoe Curve, Donner Pass & Sherman Hill) the throttle settings are in large increments. Meaning that they will only go from 0 - 13 - 25 - 38 and such. I cannot set the throttle to somewhere in between these settings and let go of the mouse.
Now, i have found that if I set the throttle to something other than the presets and hit F2 to bring up the save button, hit cancel the throttle will stay wherever I set it to.
I've looked in the manual and the settings and don't see anything on this.
Rlbomber