That smoke unit is not typical for diesels, rather for articulate steam and some odd diesels. It is a PS-1 that has the electronics under it and gets three wires.
Each smoke unit can be different requiring different mods. In either case the first thing to do is get the electronics of the PS-1 off the traces. Either a cut, or removal. Then the PCB needs to be inspected to see if an additional cut is needed. Typical Diesels do not, though some do on the unique diesel types like the picture shown. Hence the need to check it with an ohm meter to see that you have 8 ohms, not 16, 32 or in this case 0. 
G
