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 fixings.This double slip features our new versatile Unifrog design which can be operated, powered and switched like an Electrofrog or left unpowered if preferred.