It's a perfectly common mistake in such simulations, developers only think about rolling friction and regular friction, but completely forget about drag. There's also a sweet spot for efficiency in such system, but it's at full throttle. That's since the energy lost to regular friction is constant o...

When using the diesel locomotive, I couldn't but to notice a strange behavior: Currently, driving close to full speed results in the least fuel usage while driving at low speeds actually costs more fuel overall when driving the same distance. Expected behavior would be having the lowest fuel usage w...