Rupert, Packers Car Line had 400 cars (4000-4300) built by PC&F. A photo of PCX 4142 (available from Bob's Photo) taken 12/12/57 has NEW 8-57 stencils. In the 1/59 and 1/62 ORERs this was the only series listed.
Rupert, Sorry - typing to fast and not proofreading. Series was 4000-4399. Regards, Ed hawkins