To, continue. After gluing the decks back on, I weathered the wheels and trucks and when dry, refitted them. A caution here, the wheel axles have plastic, rotating bearing caps pressed onto the straight axle ends, I lost one when washing them prior to painting and another when painting. Didn't lose any from that early batch. They are tiny, tiny, tiny. These trucks are all metal with real springs too. The axles pass through the side frames, not clip in like the similar Genesis ones do. So any dismantling appears to involve removing the springs to get the bolter out of the frame, along with removing those caps to get the axles out of the side frames. While I like the attention to ptototypical detail, I think that's a "bridge too far".
Back now to getting the tractor ready for mounting onto the car. After I did the first of these, way back when, I wondered how I could reproduce the sag in the top part of the Tractor's tracks. I came up with the idea of usind a short piece of 1/16" rosin core solder. Redid the first one by glueing a piece into the groove inside the rubberised plastic tracks and bending it down once the glue had set. Wasn't bad, but the tension in the track pulled them back up again somewhat. I did a second one before putting the chains on with a better result, both times after the tractor was mounted.
This time I decided to use a piece of 1/16" steel, gas welding wire before mounting the tractor.
Cutting the wire to length, just short of the distance between the drive sprocket and front idler wheel
Bending a kink in it.
Inserting it into the top track