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Thank you for your intrest in my model of Commonwelth Tender Trucks. This is for a pair of trucks. The axles are 60" on centers. The wheels are 36" diameter. This model is meant to use NWSL P/N 37118-4 36" wheelsets. Also add coil springs in the 4 corners. I use Kadee nuckle springs. The Kingpin hole may need to be enlarged if using a #2 screw. The recommended material is Smooth Fine Detail Plastic. Smoothest Fine Detail Plastic will give the best finish surface but will cost more (Shapeways charges more for this finish, it's not me). Natural Versital Plastic may give a grainy surface.