Crossing Signal Targets N (1/160) Single and Double Sided 22 total (11 of each type). Therese are desinged to be mounted to a round brass tube for a mast. The tube size can be a maximim of 2.4mm (3/32 inch) outer diameter. The holes for the signal lights (led bulbs) is 2mm wide. If you also need a crossing gate use this:
https://www.shapeways.com/product/S4WT8RRFJ/crossing-gate-n-1-160-mechanism-5-pairs