Calcutta mail film song

You're referring to the iconic song from the 1958 Bollywood film "Howrah Bridge"!

The song is "Calcutta Mail" and it's a classic duet between Asha Bhosle and Kishore Kumar. The song was composed by S.D. Burman and the lyrics were written by Majrooh Sultanpuri.

The song is a nostalgic ode to the Calcutta Mail, a train that used to run between Calcutta (now Kolkata) and Delhi. The lyrics reminisce about the good old days of traveling by train, the beauty of the Indian countryside, and the longing for a loved one.

The song has become a timeless classic and is still widely popular today. It's a must-listen for any Bollywood music fan!