Speed Governor

Allows the player to set a limit for the top speed of their vehicle when engaged. Enabling the governor initially limits speed to your current velocity, but the cap can be raised or lowered from there with either large adjustments or small increments. The cap applies in both forward and reverse directions. Each vehicle type has its own limit that is preserved when exiting and re-entering. Every vehicle except spidertron is supported. For trains, the cap only applies under manual control. Consider https://mods.factorio.com/mod/jd-speed-limits for automatic train control. Vehicles at the limit will use proportionally less fuel than if they were accelerating.