Am 02.01.2012 21:47, schrieb Wolfgang Schwanke:
I also know that at least one line on the West Berlin U-Bahn went via
a part of East German territory.

Two U-Bahn lines and one S-Bahn line, see wikipedia link above.

These were underground lines, so easily closed off against crossing
the border. The North-South S-Bahn and one of the U-Bahn lines (U6, I
believe) had stops at Friedrichstraße, where people could change between
these two lines and to the S-Bahn going West on the Stadtbahn East-West
elevated line, or cross the border into the GDR.

Friedrichstraße was quite a complicated labyrinth back then. I mostly
preferred to cross there, when I did not come by car.

The two S-Bahn platforms on the Stadtbahn (elevated East-West lines)
which today are directional, one going West, the other going East, had
been converted into two terminal platforms with two tracks, one for the
intra West Berlin traffic, the other for the intra East Berlin traffic.
With an opaque glass wall between the two...

I think the long distance platform at Friedrichstraße was also
already open to West Berlin, but I am not sure of that.


Cheers,
L.W.