4 HO Scale Code 83 Half (1/2) 15" Radius Snap-Track with Nickel Silver Rail. Features: Code 83 track can be used with code 100 by using Atlas' transition joiners. The code of a piece of track is the height of the rail in thousandths of an inch. Code 83 rail is more to scale than code 100. Brown railroad ties with nickel silver rails. Track sections snap together. Accurately molded to detail. 8 brass rail joiners are included. Creates 1/2 of a 15" radius.