ROURKELA: Train services were affected on the busy Howrah-Mumbai main line of the South Eastern Railway (SER) on Sunday as residents of Kalunga near Rourkela staged agitation on the tracks demanding stoppages of certain trains. Hundreds of people squatted on the tracks at Kalunga railway station from 8.30 am to 2.30 pm due to which movement of at least 20 trains was affected.