Grain of Wheat 3.2mm Clear Prewired Replacement Light Bulb from Model Power. New $66.39 (29% off). Features: * Used when installing DCC and want to use the (steam) locomotive's headlight fully from the decoder. * Excellent for illuminating any part of a dollhouse, miniature room, or model railroad accessories and trains. * High quality light bulb. * One clear light bulb prewired to a yellow and brown wire.