Let me present you with the biggest construction in the city of Budapest. Its the 4th metro line. Here's a map showing the future route. This is just the 1st pahse of the project,planned extensions are present in both southwest and northeast directions.
Here are some renders of the future stations,going from south to north.
First is Kelenföld Railway station. Its a big railway station on the right bank of the city,and has good abilities to be the future "hauptbahnhof".
Tétényi road. Its a large,commie-block residential area,which is also an important spot in the district.
The next is Bocskai road. This is at the edge of downtown,also near some densely populated areas.
Móricz Zsigmond Square. This square of the city is a major transit crossroad. Numerous tramlines and busroutes meet here.
Saint Gellért Square. Its on the right bank of the Danube,next to the Technical University of Budapest. Numerous tramlines pass this narrow square.
Fővám Square. This square is on the left bank of the Danube,next to the University of Economy of Budapest. Also a main transportation hub.
Kálvian Square. The new line here meets the old M3 metro line.
Rákóczi Square. It is deep inside the city centre,along the route of the tramline 4 and 6.
Népszínház Steet
Keleti Railway Station. It is one of the 3 main railway terminals in Budapest,where numerous bus,trolley lines meet,and also the old M2 metro line passes here.
(Credit in advance to everybody who contributed in the
Metro 4 Budapest thread in the CE subforum.)