- Always a hot
category with collectors, this is a big area to collect in, with
- covers issued, past and present, from small,
little-known lines to giants,
- such as Southern Pacific. It can also be
a tough category in that collectors
- may wish to only trade their RR covers for
other RR covers. There's
- something about "Railroads," though,
that stirs the imagination in us all.
- At least 4,700 are known.