Hoi. The "battery-electric trains" mod uses battery packs, where 1 or 2 is an appropriate number. The fixed lower limit of 10 fuel items in your mod means that they get stuck in a loop trying to refuel when they have enough fuel. edit: turns out that once they actually fill all fuel slots they stop, but if you don't provide quite enough batteries...
mod: https://mods.factorio.com/mod/BatteryElectricTrain
