In real parks, tramways, ski lifts etc that shuttle back and forth often have a two cables running parallel and at the stations there is a sort of geared circle that allows the "cars" or "chairs" to slow down for passengers to hop off before it hops to the other side and goes back in the other direction. I guess there's no way to create that in the game. Monorails seem to run on a big loop more often, such as the ride around the perimeter of several of their big animal enclosures at the San Diego Zoo Safari Park.
Maybe with the monorail, or other ride, the closest approximation to a set up where multiple cars go in one direction then the other along the same route would be to create two tracks side by side and to put a station at either end with the "loop" for changing direction right after it , or maybe even to have two separate rides that run parallel in opposite directions with stations connected by paths? It would take up a fair amount of space given the game's current minimum size of 4 x 4 for laying track, but it might work with planning.
The shuttle monorail with just one car may be useful for short distances up a hill or something, for guests who don't want to climb stairs of ramps? Almost like an
elevator on an incline but with just one track.
I am terrible at planning and nice, realistic layout with my rides. Never played the coaster games, though. It was the animals that were the gateway drug for me with PZ, but I have come to enjoy the building (or trying to build) things element of the game.