Shortest subway ride?

But do they go to separate stations?

The Green Line west of downtown is even worse, on the B and C branches. There are something like ten T stops within a mile and a half in the Boston University area, and the C line stops every 500-1000 feet for about two miles. It’s insane, and I’m happy that they’re finally talking about making some changes, at least on the B branch.

Yes. One is the entrance for the Ginza station, and labeled as such. The other is for the Hibiya station, and labeled as such. They are two separate stations: the Hibiya line train stops at one, then the other.

Now, the two stations are connected by an underground walkway, and these entrances are just adjacent entrances to this walkway. But officially they are entrances to 2 separate stations.

And how far apart are the stations? Distance from entrance to entrance at the street level is NOT what we’re going by.

OK, why does the train make two stops effectively in the same place?

The actual platforms are about 1200 ft apart - and they’re that close because each of these stations connect to other, different train lines.

Subway stations in Tokyo typically have large networks of underground walkways for passenger comfort and safety (not having to walk across surface roads). In case of these two train stations, the walkways connect to each other. These two exists are designated as exits for different stations, but they’re just adjacent exits on this walkway.

That’s how you defined the distance in the OP, hence my reply.

p.s. For Tokyo, the closest distance along the track between two stations is 0.3 km (~1000 ft), on the Marunouchi line, between Shinjuku and Shinjuku-Sanchome. That’s the operational distance between the two stations, i.e. the distance the train moves. The trains are about 400 ft long, so the length of the tunnel between the stations should be less than 600 ft.

Peel and McGill here in Montreal. 296.52 metres, ~973 feet. You can see one station from the other, like you described in the quote above. You can also do that between a few other stations here.

Portland’s lightrail Blue line (it has a single underground station; I don’t know if that qualifies it as a subway, but probably not) has two very close stations: KingsHill/SW Salmon and Providence Park. I’m not sure how far apart they are but roughly a block and a half. One complicating factor in measuring the distance is that the east and west bound lines are not quite adjacent at Providence Park. The line splits going through downtown Portland and the Providence Park station is the westernmost along the split section.

Another complicating factor is that the line goes around a corner between the two stations. So it depends on whether you’re measuring along the line or as the crow flies.

I’ve tried to find the distance between them on the internet, but without success. But Portland has very small blocks, so they may be as close as 200 ft or even less.

I know there are a couple of stations on the 3 line in Brooklyn that are really close together. I used to hate it when there would be an announcement that there was a train stopped at the station ahead of us, but I could look and see that there wasn’t one anywhere close.

The Market St. Subway in Philadelphia has stops at 11th, 13th, and 15th Streets, which I estimae makes 3 stops within a third of a mile (say 1800 ft.) You can walk underground not on subway platforms, but alongside them, from 7th Street to 17th Street (you come out for a short distance by City Hall, but are still under cover).

Lots of stations in Paris are very close. I found a distance of 780 feets between the exits of Filles du Calvaire and Saint-Sebastien - Froissart on Metro line 8.

True for the Underground, but that isn’t Transport for London’s shortest journey. For if we’re including other urban rail networks - and it’s as much a “subway” as most of Chicago’s L - then the Docklands Light Railway beats it handily.
Integrated with the tube network, this covers the East End, mainly using elevated tracks, but with several underground sections and stations. Some of the stations are very close together, particularly around the Canary Wharf financial district where the trio of Heron Quays-Canary Wharf-West India Quay are each only a single span bridge apart. It’s perhaps 200-300 feet between the end of one station platform and the start of the next. If there was a direct walking route, you could trivial walk between the stations faster than you have to wait for most trains.
The reason for closeness is that there aren’t such direct walking routes. It’s an area with a very high density of office skyscrapers, but separated by the basins of the original docks. Hence you essentially get stations on opposite quays with rail bridges spanning the water.

Wikipedia claims that these “are in fact the three closest train stations on the same line in the world”, but without a cite.

Good point. I should have thought of that.

The 42nd Street Shuttle, connecting NYC’s Times Square to Grand Central, is 0.8 miles.

I feel like a game of Mornington Crescent after all this subway talk.

Not a subway, but the light rail stations in downtown Minneapolis are frustratingly close together. Nicollet Station and Hennepin Station are one block and ~575 feet apart, and Government Plaza is then only 2 blocks and ~875 feet past Nicollet. This isn’t counting Target Field Station, which now has two sequential platforms separated by about 25 feet from the west end of one to the east end of the other. The trains stop at both.

Which is still about five times the distance of the Beverly/Cortelyou stretch mentioned above.

In Paris, the Chatelet Metro station and the Les Halles Metro station were both connected in the mega-station Chatelet-Les Halles in the late 1970s, although Line 4 still stops at both Chatelet and Les Halles. The distance between the 2 stations isn’t unusually short (~1500 ft), although it is a rare (?unique) case in which one can make a free transfer to 2 different stops on the same line by walking through a station.