75720 Siliguri-Malda DEMU Passenger developed snag and remained standing on mainline b/w KNE-KDPR blocking path of all trains running behind it.When the DEMU was shunted into loop, Darjeeling Mail, Saraighat,Hate Bazare got clearance.But due to engineering restrictions & other issues,Padatik & Kamrup both were again detained for 4 Hrs. till Malda...and both arrived destination 6 Hrs behind schedule