model train G-Lab concept

> I would also add mild magnets holding each train to the track. The
> rotating arm is a smart idea to avoid having to stop the entire train to
> service or examine one cage. But there might be situations where you
> cant avoid having to bring the entire train to a halt. In such a
> situation, it would be nice if the trains would stay put and not have to
> be chased down and retrieved. Would also make the initial setup a bit
> easier, too.

That's a great idea! If the physics can be worked out... When you make
a disc (wheel) shaped magnet it's strong only on the faces; at the edges
it's very weak (and tries to keep flipping to stick down one of the
faces). But if the geometry keeps it from flipping or sliding off
track, perhaps it'd be enough to keep it from floating off.

Note too that we need at least the engine to be in good contact with the
track in order to receive power when the train starts. So again,
something to maintain this contact would be very helpful.

If magnets prove troublesome for this, an alternative would be a
roller-coaster or monorail-style track, with multiple wheels at each
point so the car can't derail. Perhaps one set of wheels are held in
place with springs, so the user can remove or replace the car without
having to disassemble the track. The devil's in the details, but I'm
sure a mechanical engineer would make short work of it.

Best,
- Joe