The 'Catfish' Ballast Hopper was the backbone of British Railways' civil engineering fleet for over four decades. Built by Metro-Cammell, these 19-ton wagons were designed for precision ballast dropping between the rails. Often seen working alongside their larger 'Dogfish' cousins, the Catfish is a must-have for any modeller looking to recreate the hardworking, "behind-the-scenes" world of track maintenance and infrastructure.