FOR ALL GAUGES. WHEEL CLEANER +/- BLACK / RED. CONNECT CROCODILE CLIP TO TRACK AND APPLY THE BRUSH ENDS TO THE OPPOSITE PAIR OF WHEELS. ADD A LIGHT CLEANING LIQUID TO CLEAN ALL THE DIRT AWAY. THESE KITS ARE MADE READY TO USE WHEN YOU RECEIVE THEM. SUITABLE FOR USE WITH DC AND DCC. AS IT USES THE SAME CURRENT USED TO DRIVE THE LOCOS FROM THE TRACK.