Very nice video! For a bit of explanation with the changes happening, only the core section of lines 3 and 4 (Albert - Gare du Nord) will be converted to metro, from next year. There is an extension under construction of future line 3 to Bordet, made to replace Tram 55 in around 10 years. Line 4 will remain as a tram line, only from Albert - Stalle (P). Line 3 will be replaced by Metro 3 from Albert - Gare du Nord, and by a new tram 10 heading to the north of Brussels (No idea if the terminus at Esplanade will still be served however), with the remaining southern sections already served by lines 4 and 7
