Trains shouldn't startup to load or unload if already off

Currently trains will startup and burn fuel while loading or unloading without needing to move. This can lead to huge amounts of wasted fuel over time when the station just has a trickle of items flowing in or out where the train keeps turning on and off until it's empty/full and leaves. It would be great if they didn't startup purely just to load/unload if they are already off but could stay running if they were already running e.g. from arriving. I've had tier 2 trains go from 95% to 20% fuel just from sitting at a station that would only pull a few resources off every now and then due to low demand because every time a single resource was unloaded, the train would startup, idle for a little bit, then turn off again. The current in-game visuals already support it logically as the stations do all the work, not the train. The current behavior can sometimes almost force the player to create waypoint stations but sometimes space is at a premium or it simply won't fit.