N Scale 10PK PRR Style Pneumatic Switch Valve Box View fullsize Photo by Keystone Details Designed to complement the PRR switch machine at Keystone Details, this will finish off the area around your turnouts. Just drill a small hole into your ballast add glue and push the pin in. purchase on shapeways N ScaleJohn LeMeriseSeptember 14, 2016lineside detal, PRR, Conrail 0 Likes