This is the interior of a Bhusawal WAM-4 #20607. To the left is the ARNO Convertor which converts single phase AC into three phase AC to operate the various auxiliary machines in the loco. In the middle are the various relays used in the interlocking circuits of the loco and to the right are the dust-cover-enclosed electro-pneumatic time delay relays for the staggered starting of the blowers. August 2005. Khalid Kagzi.