Train no 13174 DN , Loco no-32308 /CNB, departure RNI at 8.27 hrs with authority TA912 .stop between RNX -CAT at km no-11/10,12,14. Due to automatic signalling failure from 05.50 hrs and TA 912 issue authourity for above train Same time train no DN GFCG cont , Loco no 43616 /PADX departure RNI at 8.42 hrs hit wirh 13174 DN in rear portion resulted Rear SLR, PCL VAN and and GS derailed. SLR badly damage and upon the loco hood of loco no 43616 PADX , wheel of SLR inter in Loco CAb and LP & ALP may be entangle Massage time 09. 01 hrs. Both up & DN line block and up & DN train मूवमेंट hampered.