Table:
text: Vienna U-Bahn
U-Bahn network
U-Bahn network
Line Colour Route Length_ Stations
U 1 red Reumannplatz – Leopoldau 14.6km (9.1mi) 19
U 2 purple Karlsplatz – Seestadt 16.7km (10.4mi) 20
U 3 orange Ottakring – Simmering 13.5km (8.4mi) 21
U 4 green Hütteldorf – Heiligenstadt 16.5km (10.3mi) 20
U 6 brown Siebenhirten – Floridsdorf 17.4km (10.8mi) 24

Question: What is the total number of stations with a line being U 6 for the Vienna U-Bahn?

Question: Which route has 21 stations under U-Bahn Wien ?

Question: Which line was green in the Vienna subway?