A 4 bogey flat with a three cylinder crank shaft for a stationary steam engine as the load.
To assemble this car in Surveyor, work from the center outward:
1. Place the body section (this item) on the track.
2. Place a bolster (kuid2:210518:6501:1) on the track beyond each end of the car.
3. Move the bolsters under the car about half way between the center of the body and each end.
4. When properly assembled there will only be one red and one green arrow and the car will move as a unit.