Its the Allahabad ELS.
Location is: While coming from CNB side and going towards ALD , its on the left side just at the ALD outer signal (Once Naini is crossed reach to the left hand side of train).
All kinds of E Locos are available on exhibition here ranging from WAP 7 , WAP 5 to WAP 4 and sometimes if lucky enough, you could even capture MGS WAM also.