start_point: waypoint to start at
rotation: base rotation
parent: name of parent mover_adv
type:
  synchronized : like a train
  independant: uses parent track but works alone
  
NOTE: when synchronized, start_point is ignored and relative distance to parent is used instead. 
(place your mover_subs relative to the parent mover_adv as you want your train to appear. Each mover_sub should point to root mover_adv)
