For various reasons there are some stations in Shanghai that look like interchanges but actually aren’t: if you want to change trains you must leave the station, take a long walk, then buy a new ticket.
In the latest version of the metro map these are marked with a black line between the two stations. The hall of shame consists of:
1. Shanghai Railway Station
Transferring between Line 1 and Line 3/4 involves a long walk down a shop-lined passage.
2. Yishan Road
You can’t interchange between line 3 and line 4 here, even though it looks like that on many official maps. You need to go at least one stop north, to Hongqiao Road.
3. New! Pudian Road
The two stations at Pudian Road will eventually be joined by a tunnel and commercial center. For now, they are separate.
4. New! Hongkou Stadium
The latest news is that the Line 3/8 interchange will also not be ready this year