Loco is a side view horizontal scrolling game where the screen scrolls from left to right constantly as you control a steam locomotive trying to collect flags over five levels. The main playing area has you looking at your locomotive as it pulls away from a station and you must blast and destroy the various vehicles that are planes, airships and trains, when their cross your path. Below the main playing area is a map of the various tracks that can be driven on and you use up or down to change tracks when they meet.