From Spookshow: The motor is a skew-wound 5-poler with dual flywheels. Pickup is provided by 12 of the 16 drivers (the forward driver pair on each engine being equipped with traction tires). Wired wheelback wipers are used to collect current on one side (with current flowing from the axles to the engines and ultimately through the chassis on the other). The tender trucks also provide pickup, with the forward truck picking up left rail current and the rear truck picking up right rail current.
Check the tender?