Toei runs 6 rail lines: 4 subway, 1 light metro, 1 light rail. Each is technologically incompatible with the other 5.
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(The subway lines include one linear motor line and three conventional lines running on three different track gauges.)
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The three conventional lines at least have through services with other rail networks matching their respective gauges!
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Replying to @davidbaron @alon_levy
My favorite is the every-40-minutes (I think) Haneda Airport - Keikyu Airport Line - Toei Asakusa Line - Keisei Main? Line - Narita Airport.

Sep 23, 2017 · 6:27 AM UTC