This mast assembly includes one 3/64" x .006" x 2.75" brass tube and one 1/16 x .006" x 2.00" brass tube, resin platform and base, laser cut platform framing, and stainless photo etch ladder assembly details.

The CPL consists of a central position target with up to four pairs of doublet lens units around the perimeter of the background disc. The lens units are spaced at 45-degree axes using the positions: green |, yellow /, red—and a lunar white \ for restricting also being present in some installations. The main head is surrounded by up to 6 markers at the 12:00, 2:30, 4:30, 6:00, 8:30 and 10:30 o'clock positions. The function of the main head was block occupancy information with green representing two or more clear blocks, yellow one clear block and red/lunar white representing a restricting indication, meaning the engineman was permitted to enter his train into an occupied block. The individual marker lamps provide speed information, 12 o'clock being Normal speed, 6 being Medium speed (Limited speed if flashing), 10 being Normal to Medium (Limited if flashing), 2 being Normal to Slow, 8 being Medium to Medium, 4 being Medium to Slow and no lit markers being Slow to Slow. Info taken from Wikipedia.