Cherbourg's Gare Maritime or Gare Maritime Transatlantique was a railway station at the end of the railway line from Paris' Gare Saint-Lazare and of the short branch from Cherbourg's main station.
Wikipedia https://en.wikipedia.org/wiki/Gare_Maritime_de_Cherbourg
Coordinates 49°38'45.217" N -1°37'3.178" E