#6 Double SlipPECO Streamline OO HO CODE 83 Crossing, #6 Radius, Double Slip Double slips can save valuable space at station approaches, junctions etc. 83 Line items are realistic models of North American railroad track, with Code 83 nickel silver rail. Scaled from A. R. E. A. drawings and NMRA compliant, Code 83 features authentic tie sizes and spacing, the standard American number system for frog geometry, plus a very fine representation of traditional rail spike