Explain "adrift".
As new, the trailing truck fits fits into a slotted cross beam and floats across the width of the loco to allow use of a smaller radius.
The truck itself can be pulled off its mounting fixture and will be left hanging by a thread ( literally! ) although this thread is the pick-up wire from the trucks to the Decoder.
If your truck appears to be adrift as per the last explanation, then all that is needed is to grasp loco upside down in one hand and apply firm pressure in the centre of the truck with the other hand push the truck back on to it its mounting spigot. Just watch the pick-up wire feeds up through the spring centre and into the Tender without getting trapped anywhere,
As new, the trailing truck fits fits into a slotted cross beam and floats across the width of the loco to allow use of a smaller radius.
The truck itself can be pulled off its mounting fixture and will be left hanging by a thread ( literally! ) although this thread is the pick-up wire from the trucks to the Decoder.
If your truck appears to be adrift as per the last explanation, then all that is needed is to grasp loco upside down in one hand and apply firm pressure in the centre of the truck with the other hand push the truck back on to it its mounting spigot. Just watch the pick-up wire feeds up through the spring centre and into the Tender without getting trapped anywhere,