Rpo Cancel - Question From A Newbie

I'm interested in USA cancelations.

On a RPO (Railway Post Office) cancel. that meaning has the initials RMS?

Thanks so much

Railroad Mail service.

https://goscf.com/t/20890

Railway Mail Service, I believe.

Thanks Stallzer and Battlestamps.

I have some doubts .... the initials "CAR 2" .. what is this?



In this cancels ... What is "E.D." , "S.D" and "S.R."?



Thank you very much.
David

E.D. = Eastern Division
S.D. = Southern Division
S.R. = Short Run

Not sure about "CAR 2" but it could be what it sounds like (i.e. Railway "Car" No. 2)

CAR is not an abbreviation - it is simply the word "car" Railway mail cars were built to be mobile post offices. Essentially they were converted box cars where the postal clerks sorted and cancelled mail while the train was going on its route. This speeded up the mail in that it did not have to wait to be processed in a regular post office. CAR 2 would simply be the designation for the second of many RPO mail cars that were operated on that railroad.

SD is Southern Division
ED is Easten Division

SR is Short Run which would have been a train that did not travel the full length of its route.

If you are going to be collecting RPOs there are a number of excellent reference books on the market. I am in no way affiliated with the following individual and I am sure you can find these books for sale in multiple places but this includes a good list of what is out there http://www.postal-history.com/allbo...st.rpos.html

The MPOS (Mobile Post Office Society) is probably the best source, since they pretty much write and publish most of the RPO books.
https://www.eskimo.com/~rkunz/mposhome.html

The cancel bearing CAR 2 is from a streetcar RPO and indicates the car number.

Thank you at all .... good books. I will buy some book, sure.