Switch on rear reverses polarity.
GAUGEMASTER Single Track Cased Controller GMC-100M
GAUGEMASTER Single Track Cased Controller for G Scale GMC-10LGB
GAUGEMASTER Single Track Cased Controller w/ Fan for G Scale GMC-10LGB5F
Gaugemaster Single Track Cased Controller for O Scale O Gauge GMC-100MO
Gaugemaster GMC-100M Single Track Cased Controller
Gaugemaster 100MO Single Track Cased Controller for O Scale
