Rather than start another thread I'll post this here.
This is an Athearn Pacific.
From what I've been told ,it's the first of three production designs which was built in 1960 only.
The earliest models (pilot models) were produced in 1959,
with Hi-F drive.(I'm not sure any of these were sold). The geared rear-drivers Pacific was produced in 1960. It has
plastic drivers. The 1961 intermediate-production Pacific had center drivers
driven; again, plastic drivers.
The late production models of 1962 - 1965 also
had the center drivers driven, but the drivers were metal.