A track assembly can move even when its little rollers are fixed details. Separate those observations when reading a listing or watching a demonstration: they describe different components.
| Observation | What it establishes |
|---|---|
| The track loop travels | The linked or flexible track can move |
| The model slides across a desk | Movement across the desk, not proof every roller turns |
| A small roller rotates visibly | That individual component moved in the demonstration |
The Next Generation 320 inspection describes moving tracks and static rollers. The 6060 coal shovel adds a different limitation: its tracks moved by hand but met too much friction on most surfaces. These are not contradictory descriptions.
Choose the demonstration that matches your interest
- For a static shelf: inspect alignment and the intended stance.
- For visible mechanism detail: ask for a close view of the actual component.
- For rolling behavior: ask what surface the seller used and keep the result specific to that example.
A resistant track is not an invitation to lubricate or pull it. These observations do not establish a repair procedure or a safe force limit.