I'd like to see something like that but on a subway. Just a platform and two tunnels with no stairs. If the service stops you're SOL and have to hoof it down the tracks.
Friedrichstraße was famously like that during the Cold War (West Berliners riding the lines were not permitted to exit into East Berlin), although of course the stairs physically existed. I think it's unusual for an underground station to be built without digging from the surface, so there's normally at least a fire escape.