derailvalley Small game logic change, "Engine service" requirements

[Stikikeys]

I wanted to make the game more realistic by making changes to the engine service for Diesels only. At the moment you have to service the entire locomotive to clear the fees. The changes would simply take the engine service requirement as put in in a separate pile where you only have to service the engine when the red light comes on but you may do so if you wish before hand as an option but the new rule would be just do it when it's actually required.