Two that come to mind: Deutsche Bahn still transfers the seat reservation database to the trains using diskettes. And San Francisco Muni uses 5.25 Floppies for their light rail trains.
General rules:
Exceptions may be made at the discretion of the mods.
Two that come to mind: Deutsche Bahn still transfers the seat reservation database to the trains using diskettes. And San Francisco Muni uses 5.25 Floppies for their light rail trains.