 To accelerate the train still further, the traction motors are reconnected in series-parallel connection (2 parallel circuits with 2 series-connected traction motors in each).For this purpose, in starting notch #12 the controller closes a pair of parallel contactors and opens the bridge contactor.After this the controller moves to starting notch #13, which closes contactors #1 and #2 and opens both field-weakening contactors; this assembles 2 parallel circuits, each of which comprises 2 traction motors and a group of starting resistances connected in series and has a total resistance of 4.97 ohm.