 To coast, the engineer moves the controller handle to 0; this opens the line contactors, thereby shutting off all power to the traction motors, and moves the controller into starting notch #1 (therefore if the traction motors are turned on again, they are connected in series and all the starting resistances are in the circuit).The traction motors are mounted on the truck frames (see above), which protects them from impact when rolling over rail joints and reduces the train's unsprung weight.The first ER2s had the same DK-106B traction motors as the ER1; these were DC series motors (the armature and field windings were connected in series, as is normal for variable-speed DC motors) with 4 main and 4 auxiliary poles and wavy armature windings.