Tension prevailed in the area with police seizing a large cache of ammunition from the site and arresting 320 people.
Senior BJP leader Brijpal Teotia and five others were seriously injured when they were attacked by armed assailants in Ghaziabad on Thursday.
Chaudhary, who took 13 hours to reach Lakhimpur Kheri from Delhi, several hours more than it would take to cover the 420 km-odd distance, also met the families of some of the farmer victims to learn their story of loss.
The blast occurred in a general coach of the train between 9.30am and 10am when it was on its way to Ujjain from Bhopal, Railway PRO, Indore, Jitendra Kumar Jayant said.
Senior party leader P Chidambaram, Chhattisgarh Chief Minister Bhupesh Baghel, Punjab Chief Minister Charanjit Singh Channi and Shiv Sena leader Sanjay Raut expressed support to Priyanka, who has alleged that no notice or first information report (FIR) has been given to her even after her 38-hour detention and was not allowed to meet her legal counsel.
A group of armed men in police uniform on Sunday attacked the Nabha Jail in Patiala and fled with five prisoners, including Khalistan Liberation Front chief Harminder Mintoo.