Another reminder, the Pullmor is series connected. All of the ERR and Lionel drivers simply reverse polarity to the motor leads. To apply that to a Pullmor you would have to wire it in parallel and feed a constant DC to the field. That will more the double the current draw. BTDT. Also the Pullmor only has a three pole armature. Jon Z has stated cruise is iffy with only three poles. You really need at least 5 poles.
Pete