I personally am very happy with the Japan Travel app (App store link, Google Play link) by Navitime. It is very good for finding trips from one train station to another (sometimes it provides bus routes but that is very unreliable). But most importantly, it lets you choose the following options for route search:
Furthermore, it allows options to avoid rain (i.e. indoor transfers) or least steps but I haven’t tested all of them. It knows which routes you can take with different flat rate passes and it is aware of traffic disruptions. I believe it essentially uses the same raw data as HyperDia but since it is aimed at tourists all its interfaces are in English (and I am not sure whether HyperDia even features a fully functional app).
I found it searching for train timetable apps two years ago when I visited Japan for the first time. I am not affiliated with the app or its company in any way.
If you use the Jorudan (https://world.jorudan.co.jp/mln/en/) trip planner, it splits the change time into transfer time and waiting time. The transfer portion can give you an indication for how far away the different platforms. The times given are generally the maximum and on the Japanese version of the site you can specify how quickly you can do transfers
■Jiyugaoka(Tokyu) Platform 5.6
| Tokyu-Toyoko Line (For Ikebukuro) Center
| 10:20-10:32 [12 min]
| 160 yen
◇Shibuya Platform 5.6
| Direct
◇Shibuya Platform 5.6
| Tokyo-Metro Fukutoshin Line (For Ikebukuro)
| 10:33-10:40 [7 min]
| 280 yen
◇Shinjuku-Sanchome Platform 4
| Transfer
| 10:40-10:50 [Transfer 6 min + Wait 4 min]
◇Shinjuku-Sanchome Platform 2
| Toei Subway-Shinjuku Line (For Motoyawata) Forward/Rearward
| 10:50-10:57 [7 min]
■Kudanshita Platform 6
Unfortunately, there is no easy way to do this. The train companies don’t advertise long walks, they advertise “connected to …”.
Checking the transfer time works in the short-time direction but not for long times. If the transfer time says “2 minutes” that is likely a platform change, but if it says “10 minutes” you don’t know if it is a 9 minute walk followed by a 1-minute wait or walking across the common platform (about 5 meters) and waiting 10 minutes for the next train.
You have already discovered that different stations have huge differences in transfer distance, that happens a lot. A rather epic difference is Hanzomon to Ginza lines. At Shibuya it’s sub-basement to 3rd floor in a different building, at Omotesando (the next stop) it’s across the common platform.
“interchanging at large train station” does not guarantee a long walk. Shinjuku is the world’s busiest station but is quite compact. JR to Odakyu can be 2 minutes, IF you get off the train at the right place and use the underground transfer gate.
Also consider that the transfer time assumes no wrong turns, no lines, no crowds, and a brisk walking pace. Actually getting there in X minutes not guaranteed.
A simple Hyperdia search should be all you need in most circumstances; just search for your route and see the transfer times that are given for each possible transfer option. For example if you search from Kanda to Otemachi, you see that it does indeed show longer transfer times at Mitsukoshimae vs. at Nihombashi.
If you want to see for yourself what the transfer looks like, many people have documented them on YouTube; for example see here and here. You do need to know the Japanese names of the station and lines to know what to search for, however.
Credit:stackoverflow.com‘
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