3D printed replacement for the Triang class 31 (A1A-A1A) and class 37 traction magnets. With nickel silver rails, the traction magnets no longer aid traction, and cause the wheel sets to pull over to one side. Replacing the magnets with our 3D resin printed alternatives will allow the locomotive to run with centred wheels, while maintaining the other function of the magnet, holding the armature bearings in place and allowing improved low speed running of these old locomotives. Price is for a pair.