P7 led NJP Shatabdi overtakes P4 led 12504 Agartala Humsafar : #30478 HWH WAP-7 led 12042 NJP HWH Shatabdi Express clattering through DKAE, overtaking a looped 12504 AGTL BNC Humsafar Express led by #22818 MGS WAP-4 (undergoing an extended scheduled stop).