I need a little help with the Mojave to Bakersfield sesson, specifically the climb from Mojave to Summit. The speed limit thru Mojave is 20MPH, but I always start slowing down after passing thru Mojave, near one of the railroad crossings. When the speed limit goes from 20 to 40, I cannot get the train to get from 20 to 40MPH, still slugging my way to the summit at 20MPH. Even then, after a while I start slowing down, so then I have to notch up to where the needle is 'in the red' on the dial in cab mode. Only then will I finally start gathering speed. Can someone provide me some advice to prevent the train from losing speed and instead gain speed?