No.20 Madras Mail is a 1990 Indian Malayalam-language comedy thriller film directed by Joshiy and written by Dennis Joseph from a story by Harikumar. The film stars Mohanlal in lead role and Jagadish, Maniyanpilla Raju, M. G. Soman, Ashokan, and Suchitra Murali in supporting roles, while Mammootty appears in an extended cameo as himself. The background score was composed by S. P. Venkatesh while the song was composed by Ouseppachan. The plot follows three youngsters who are embroiled in the murder mystery of a young woman in a train journey from Thiruvananthapuram to Madras.

Plot

The train No.20 Madras Mail to Madras starts from Trivandrum Central railway station. R. K. Nair, a Kollam-based businessman takes the first class coach to Madras with his wife Geetha and daughter Devi from Kollam Junction. Tony Kurishingal, along with his friends Hitchcock Kanjikkuzhi and Kumbalam Hari boards the same coach from Kottayam. Tony is the son of a wealthy businessman, Kurishinkal Kariyachan, Kanjikuzhi is a detective novelist and Hari is a young politician. The three of them are going to Madras to see a test cricket match, a cabaret, and to make attempts to make Kanjikuzhi's novel Vaarikkuzhiyile Kolapathakam a movie. All three are drunkards.From Ernakulam Town station, another passenger Sunil boards the train at the last moment.