Train otakus

There are many train otakus in Japan, and there's a bunch of train-related videos in NicoNicoDouga too.

If you have ever visited Tokyo, you'd probably tried the JR Yamanote line, the major train in Tokyo that circulates in a loop. This video is from a concert of musicians playing the bells of Yamanote line in each station.

タケちゃん＆健ちゃんライブ　ソロコーナー 2/3　2009/04/04

This one is by Jimuin-G, a musician that I wrote a post about last year.
He thought the bells of those stations were short, and created a music out of the bells.

電車の発車メロディーを勝手にアレンジして弾いてみた

This creator made Hatsune Miku sing the Yamanote line bells.

初音ミクがJRの発車音楽を歌ってみました

Miku Yamanote line video evolved to this video:

初音ミクが『山手線上のアリア』を唄ったようです（一部開通）

Some people started making MAD animes using train photos.

【MAD】チバスターズ！

This is the comparison video (on your left you can see the original anime music, on your right you can see the "train" version)

チバスターズ！の比較動画

Something similar- MAD video of "Kikyu(Keihin Kyuko Line) trains" with Opening video of anime called "Keion"

【MAD】けいきゅう！