This is the carbody for a 3-bogey flatcar. There is an attachment point (a.load0)
in the center of the car.
Assembly instructions:
1. Place this item on the track.
2. Place MARSZ 3-Bogey Bolster on the track on the end without a 16-wheel bogey under the car body.
3. Move the item in step 2 under the carbody until they couple.
4. When properly assembled there should only be 1 red and 1 green arrow, the car should move as a
unit, and all three bogeys will follow the center line of the rails.
5. Change the kuid in he config for bogey-2 and bogey-3 to the couplers of your choice.
There is a screenshot taken in surveyor showing the parts arrangement and the assembled traincar.