Hey SirDragonClaw, thanks for your inquiry. Have you tried the mod? I could add fuel-dependent acceleration, without too much effort, but I doubt it would contribute much to the experience. Do you have an interesting scenario in mind where it would actually matter? I feel like nerfing trains running on wood or coal would be too strong a deterent for the early game, and I don't feel like the trains should move any faster than they currently go. Even with the current speeds they are actually incredibly powerful and fast, when compared to real life trains.
