Miles City & Spok. R.P.O. postmark.
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Posted by David Schott (+13410) 5 months ago
The "MILES CITY & SPOK. R.P.O." postmark on this post card that's offered for sale on Ebay caught my attention:



Here is a discussion of Railway Post Offices from Trains magazine:

Trains: Railway Post Offices, Moving and sorting mail By Robert S. McGonigal | June 5, 2006
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Posted by ike eichler (+1232) 5 months ago
There are many Miles City R P O themed postmarks. Some with Miles City first others with Miles City second Some with MSP&PRR headings. Make and interesting collection.
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