By now, most customers pretty much know what to expect when they enter through the heavy glass door, small green letters hanging overhead on the building exterior.
But Mr Bozic says both numbers and breeding quality have since improved, although not enough for him to contemplate selling a horse to eager Germans and Americans hanging around his door, or sending a team to the Olympics.
If something gets in the way of the door--a person's foot or a roof panel that's hanging down--the electric motor that closes the train door has to work harder and produces more current.