Train station stamps, or Eki stamps, were first introduced in 1931 as a means to increase tourism and use of the railways.
Japanese Trains, Railroads Stamps for sale
Introducing Japanese Popular Culture [2 ed.] 1032298081, 9781032298085
Japanese train poster hi-res stock photography and images - Alamy
Working Notes on Japanese Postcard Publishers – Personal Site of Peter Romaskiewicz
Japanese Stamp - 使用済切手/官製はがき
Island fuji hi-res stock photography and images - Alamy
Japanese Flowers Photographic Prints for Sale
JR East Redesigns All 78 of Their Central Tokyo Train Station Stamps
Japanese Trains, Railroads Stamps for sale
Eki Stamp Your Way Through Japan Train Routes - Kulture Kween