This Marklin 5516  E91 Electric Locomotive features 6 axles powered by means of 2 motors and side rods, and 4 traction tires. The Doors can be opened. The diaphragms made of real leather. Also featured is a built-in digital high efficiency propulsion motor for operation with DC power, AC power, or Märklin Delta/Digital, and adjustable maximum speed and acceleration / braking delay. The pantographs can be raised and lowered in digital operation with the 6021 Control Unit. Built-in sound effects circuit for digital operation, with a locomotive whistle that can be turned on and off are included as well. Sound effects of the locomotive in operation can be turned on and off with the switch on the underside of the locomotive. The direction dependent triple headlights can be turned on and off in digital operation. They are on constantly in operation with DC power, AC power or with Märklin Delta. Their brightness depends on the amount of voltage present in the track