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This is a set of 30 non-functional models of the General Railway Signal Model 5 switch machine in N Scale. This type of switch machine is used in many places in the US to power railroad switches (turnouts).
Each unit is 5.7mm (0.22") wide, 12.42mm (0.49") long and just over 2mm (0.08") high. The bottom is flat so that it fits over any ties, throw bars and obstacles. Because of the small scale the hand throw and other thin details can not be shown.