The fast routes would be another story.

The front coach would extend a shield backward to cover the nose of the car behind. This would provide a nearly wind resistance free path to the cars behind. On the fast routes there would be speed and efficiency but not much of a view. There would be a temptation to put many of these fast routes underground. It would be efficient to allow the vehicle to evacuate these underground tubes to reduce airflow resistance. In that case living air-breathing things in the coaches would not fare very well.

The greatest resistance to the movement of this wheel assembly thru the channel would be air passing from the front to the back. An air dam could be placed in the front of that assembly which pretty much filled the channel. One-way flapper valves would allow the air out of the channel. Rubber lips could seal the bottom covering the coach suspension leaves. A vacuum would be created that would allow the next coach thru the channel easier passage.

Coaches need not all be the same size, but the size mentioned above should be the maximum.

The Moki Passage will be used for deliveries of single smaller items without a human driver. It would be inefficient to take up space with a people sizes vehicle. These smaller delivery vehicles of the same size should travel together on the fast routes. The computer would know about and consider construction, detours, or congestion.