If you are travelling from ambala to kolkata then there are number of trains you can choose. Some of the trains that run on this route are Nldm Koaa Exp, Jalianwala B Ex, Asr Hwh Express, Akal Takhat Exp, Asr Hwh Mail, Kalka Mail, Asr Koaa Sup Ex, Sealdah Express, Fzr Hwh Spl, Himgiri Express and etc. There are different starting junctions like Ambala Cant Jn, Ambala City. You can also choose your train according to total time taken by different trains which varies from 41 hrs 8 mins to 25 hours 5 mins. Choose your train according to your suitability like trains that run on daily basis like Kalka Mail, Asr Hwh Express, Asr Hwh Mail, Sealdah Express or train that run sporadically like Jalianwala B Ex, Nldm Koaa Exp, Asr Koaa Sup Ex, Fzr Hwh Spl, Akal Takhat Exp, Himgiri Express etc. There are number of trains running daily and sporadically from Ambala Cant Jn( like Asr Hwh Mail, Jalianwala B Ex, Akal Takhat Exp, Fzr Hwh Spl, Kalka Mail, Himgiri Express, Asr Koaa Sup Ex, Nldm Koaa Exp ), Ambala City( like Sealdah Express, Asr Hwh Express ).