Factorio TrainSaw

I made a TrainSaw to cut up the biters infringing on my property. I have no idea how many train engines or cars there are, but I think the ratio is 2:5 or so. The length of the train is the perimeter of this base. I used conveyor belts to make a timer, causing the train to park at the refuel/repair station every 30 minutes or so.