Performance
The WDP-4 is capable of hauling 24 coach trains at 110–120 km/hour. It has also been used for speed trials where it has hauled 8 coach trains at 160 km/hour.
The locomotives can be used in either direction, and frequently haul trains long hood forward, as in the picture. Newer editions with 4500 hp have been produced which have been named with the sub class WDP-4B /WDP-4D which have different traction control with six traction motors and are Co-Co bogie equipped (more similar to WDG-4), unlike the original which has a Bo-1-1-Bo arrangement with four traction motors. Due to some controversies regarding visibility hindrances faced by loco pilots in driving long hood front, the basic WDP-4B model has been modified to dual cab to eliminate any such possibility. Other features of WDP-4B and WDP-4D are same. The cabs have a slightly wider profiles, to improve visibility.
Some of the WDP-4B/WDP-4D are spotted having provision for an inverter-driven head-end power unit, allowing running trains without a generating car (EOG) for hotel power.
The loco is very fuel efficient and has minimal exhaust emissions due to its 2 stroke diesel engine. It is characterized by its loud horn, which can be heard for large distances around, and aircraft-like sound of its running engine.
Read more about this topic: EMD GT46PAC
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