The Train (1970 film)

The Train is a suspense movie starring Rajesh Khanna and Nanda. The film did above average business at the box office. Khanna stars as Police Inspector Shyam Kumar who sets out to solve a series of murders which have all taken place on a train. Complicating the situation are his girlfriend Neeta Nanda, who has been acting mysteriously ever since she began her new job, and hotel dancer Miss Lily Helen, who needs to seduce the good police inspector but may find that she loses her heart instead.This movie was coproduced by Rajendra Kumar and it was Nanda who suggested Rajendra to cast Rajesh Khanna in the main lead.

Source: Wikipedia