Articles I created/contributed main parts, or added some contributions include:

Railways

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Lists, generals

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Normal railways

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Private railways

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Railways in Hokkaido

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Railways in Shikoku

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Transits in Greater Tokyo

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Greater Tokyo rail network map.

Transits in Nagoya

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Transits in Fukuoka

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Freight rails

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Funiculars

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Aerial lifts

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Tramways

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Things even more obscure

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Model railroad of handcar tramway.

Smart cards

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Water transits

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Languages

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Kesen kana "si"

Some other bits

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Bentenjima, the northernmost point of Japan.