However, this model hasn't exactly taken the world by storm, Škoda has only
managed to sell it to two cities - or one other than Prague for which the
model was effectively custom-designed for. Most of Škoda output has been
more 'conventional' fixed bogie trams.
Not that many of the Chinese CSR Sifang versions have been built either.
The Chinese were just trying everything out attempting to license Western
technology wherever they could, reverse engineering it where they couldn't.

The 15T might technically be a good tram (I've visited the factory where
they were built and saw several of Prague's 2nd series under construction
but I've never actually ridden on one!), but it has gone nowhere in the
market. I presume the jacobs articulation makes them too expensive.
Even their run in Prague has finished - after 250 cars were delivered.
Škoda has won the next order, but the concept is for a ForCity Plus tram -
which has fixed bogies under the middle of the car and a 'suspended' middle
module. It only retains pivoting bogies at the car ends, so even Prague has
abandoned the jacobs concept for their next series of trams.

And the ForCity Plus works around the problem with space for the end bogie
to pivot by putting them far forward under the drivers cab, which is raised
to accomdate it. I assume the non driving end of the single-enders has a
step to a 'raised rear lounge' area.