Saishuu Chikan Densha
English title: Midnight Sleazy Train
Japanese title: 最終痴漢電車
Alternative titles: Saisyu Tikan Densya, The Last Molestor Train
Type: OVA
Source: Visual novel
Episodes: 3
Status: Finished Airing
Aired: Sep 25, 2002 to Feb 25, 2003
Duration: 29 min per ep
Rating: Rx - Hentai
Studios: T-Rex
Producers: Milky Animation Label, MS Pictures
Licensors: Media Blasters
Genres: Hentai

In a crowded train, strangers are likely to end up being too close for comfort. But for some people, being too close is a comfort. When a poor conductor witnesses the bizarre yet inviting ritual of anonymous train sex, he jumps on the opportunity to turn it into a business. Every night after the midnight train ends its route, he turns it into a rolling bordello. Get ready to climb aboard... the sleazy train is coming. 

(Source: ANN)