HO! PRR Style Switch Machine 10 LH & 10 RH View fullsize N Scale model shown, Photo by Keystone Details This PRR style pneumatic switch machine has been scaled up from Keystone Details N Scale version! The set provides for 10 each of left and right hand machines. NOTE: This is an HO scale Product. purchase on shapeways HO ScaleJohn LeMeriseSeptember 12, 2016lineside detail 0 Likes