Peco SL-80 Single Slip 00 GaugePECO Streamline OO HO CODE 100 Crossing, Single Slip Single slips were often used on double track lines to incorporate a trailing crossover into the access for a siding, goods yard etc. If you wish to mix wheel standards on your 00 H0 layout, this is the trackage to choose. Code 100 rail allows flange depths up to 1. 6mm which means that both vintage and current stock will run happily together. The wide range of turnouts and crossings in this series