DCD-GS-RG 12x 2-wire Red/Green Ground Signal12x 2 wire Red Green Ground Signal A pack of 12 x 2 lamp plug and play signals in 4mm scale (OO), supplied with NO control board. The DCD MGS RG is a simple design 2 lamp ground signal that was first seen on a limited basis in the 1920s in the UK, but it was very widely used internationally. In addition to its world wide use, it is also perhaps the perfect indicator signal for those with large storage or fiddle yards, giving a clear Red Green