No more tedious wheel cleaning! Clean locomotives and rolling stock wheels quickly, without scratching. Roto Wheel Cleaner cleans all wheels at once and quickly. Power from transformer or track, the Wheel Cleaner works with both analog (DC) and digital (DCC) control systems. N scale Roto Wheel Cleaner will accommodate locomotives up to 6 3/8"" (16.1 cm) and rolling stock up to 5"" (12.7 cm).