And tram technology in evolving too. Don't think trams will have drivers
for ever. They will either go driver less or disappear.

http://www.metro-report.com/news/single-view/view/autonomous-tram-stabling-experiment-completed.html

Alstom modified a Paris T7 tram to stable itself in the depot. Other
operators are testing 'collision avoidance driver assistance' systems
for use 'out on the road' too.