Which single stop subway line extension do you want the most?
57% Blue line to Charles/MGH
33% Line 10 to Gare de Lyon
10% Songshan Line to Kunyang
21 votes • Final results
4
Did they ever extend the U1 in Berlin to connect to the main trunk lines at both ends?
2
Replying to @khuey_
The east end connects to a roughly-parallel S-Bahn line at Warschauer Straße; the west end is unconnected but I think any sensible extension would be more than one stop.

Jan 4, 2021 · 5:41 AM UTC