RDSO Coach is designed specially for such purpose. it serves a Dynamo Car for any tests.
180 km/h is the speed when it goes for a test and 160 km/h is the restricted.
Indian Railways needs not puny locos like P-5, but a Train-Set, better, faster n more comfort.
RDSO must concentrate on such technology ones.
P-5...
more... must b kept as secondary option, coz' Train Set are the future of Railways.