On my route I have a number of places marked with invisible speed signs to mimic 'Slow Orders'. the only problem is that these slow orders are quite a bit slower than the mainline speed (Line speed is 50mph, slow orders are between 15/35mph) and when the trains hit them, they're still going at or near line speed, then quicky slow down to the slow order speed. Is there any way to get the trains to slow down before the marked point?