>>963588Heavy metro, which probably would have meant to close most of the surface trams.
Most of the current tram lines are short (15-20 minutes city to terminus) so that a heavy metro would bring any significant time savings.
It could have been interesting for the eastern branches of tram line 1 and 4 (4 and 5 on the fantasy metro map), which have travel times of about 40 minutes from the city. There already run express trams that shave off about five minutes and line 1 also has a commuter rail station at its terminus.
Same goes for the northern suburbs where various bus lines run to the terminus of tram lines 2, 3 and 10 (or fantasy metro lines 1 and 2). It is now also served by a commuter rail line every 15 minutes.