Discussion relating to the PRR, up to 1968. Visit the PRR Technical & Historical Society for more information.
  by Otto Vondrak
All we know is this... Our Railway Post Office was built as PRR 61950/6513 in 1910, part of their class M70. Fourteen BM770nb's were rebuilt from M70 full-length RPO's between 1950-1953. Anyone have any more details about this car in our collection?