The railways also did Post and Packages, as well as operating Buses, operating "Bahnbus", at least in .de.
For some more history of that in roughly reverse chronological order:
https://en.wikipedia.org/wiki/Thurn-und-Taxis_Post
https://en.wikipedia.org/wiki/Kaiserliche_Reichspost
https://en.wikipedia.org/wiki/Omodeo_Tasso
( Now singing: https://de.wikipedia.org/wiki/Hoch_auf_dem_gelben_Wagen )