So did I -
There is no immigration and no customs when flying on the the SBB's FlugZug from BSL to ZRH, and in Kloten the train arrives "downstairs" in its own terminal in the celler.
SBB also runs services to other Swiss Airports GVA Cointrin for one - and you can also go to BRN and LUG from ZRH. :o
In fact the FlugZug must be the only "Flight" that has check-in on board and - at least so far - NO searches and NO baggage x-ray - and you do your own baggage handling - Sowthwest, Go, Ryan, Easy don't copy them too close now.
OK jokes over - SBB's FlugZug is a train (2 man crew only - a jockey front left and a senior steward F/A and check-in all in 1) and it can be stratched to be a 600+ seater immediately - so fleet management and efficiency are high - think of that Airbus & Boeing.
