Originally Posted By: Drew Hause
Not sure what Slovakia was c. 1920s
Železnice Slovenskej Republiky

http://www.hungariae.com/Markings.htm
ZSr = Artillerie Zeugsdepot Sarajevo


Drew--Czechoslovakia was one of the pieces of the old Hapsburg Empire that emerged as an independent entity, courtesy of the Treaty of Versailles. So it would have been Czechoslovakia in 1928, which it remained (not counting Hitler's annexing the Sudetenland) until the relatively recent and relatively amicable "divorce" that created the Czech Republic and Slovakia.