Anti Collision Device (ACD) equipped Pune WDM 3A # 18578R starts the 1609 passenger to Kolhapur out of Wathar. The small device on top of the short hood and also short stub antennae over the cab roof are parts of the GPS based ACD. The ACD is currently activated only on the KR and can be used to automatically stop the loco in the event of any hazardous situations. Wathar, 2004-07-24. By Apurva (iti@vsnl.com).