Gaugemaster GM37 Axle Hung Track Cleaning Pads - OO Scale (3) Brand: Gaugemaster Part Number: GM37 Scale / Type: HO / OO Scales OO/HO. These axle hung cleaning pads kiss the rails as they traverse your railway, picking up any dust that is on the track. When used with the high frequency track cleaners and track rubber, you give yourself the best chance in the fight against dirty track.