It's usually pretty difficult to stay updated on construction projects abroad so let's give /n/ a quick rundown on the most important metro/tram/lightrail lines/extensions currently being built in whatever shithole you live. Ranting about meme buses allowed.

I'll start
>The Netherlands

Amsterdam:
Noord/Zuidlijn - North/South line (new metro line, 9,7 km)
>Opening July 22. Now being tested
>Will be the most important metroline in Amsterdam and become the backbone of all transport
>The entire structure of the tram network will change, almost all lines get a different route. This is a pretty big deal because most lines have barely been changed (only extended) since they started operating 100 years ago
Amstelveenlijn (hybrid metro/tram being converted to light rail and extended)
>light rail line now still part of the metro network, trams sharing metro tracks and tunnels in the center
>will be disconnected from the metro network, amount of stations reduced, grade crossings removed and extended from Amstelveen Westwijk to Uithoorn, becoming Amsterdams first modern interurban tram line
>Construction starting next year, finished in 2021

Rotterdam metro:
Hoekse Lijn (24 km)
>Rail line currently being converted for metro operation, planned to reopen in September as an extension of metro lines A and B

Den Haag tram:
Line 19
>new tram line, partly finished but will get an extension in Delft in 2020
Upgrade to lightrail standards
>network is currently being upgraded for broader vehicles and bi-directional operation. Platforms and curves are being adjusted, and slowly more and more turning loops are being replaced by tail tracks

Utrecht lightrail:
Uithoflijn (8km)
>new line opening next year
>existing light rail line will be converted for low-floor trams to allow through services on the new line in 2020