I'm designing a city building game in a huge 3D (without any notion of "top" or "bottom") space station (or rather, a space city). There are various functional buildings (vertices) connected by corridors (edges) forming a network (not a planar graph in general because 3D).
Each corridor is a bundle of multiple "ducts", which can transfer various resources (e.g. electricity, fluids, rails) between buildings. High speed transportation of passengers and goods is achieved by taking shuttle vehicles moving along the rails. To travel from point A to point B, a vehicle has to find a path e.g. A -> C -> B (where there are corridors with a rail from A to C and from C to B, but not from A to B directly), enter the A-C rail, transfer to the C-B rail at C, and finally stop at B.
The above are the basic rules for the game mechanics to work (i.e. a 3D network version of Factorio). What I would like to ask about is a plausible explanation for the vehicle mechanics.
I plan to explain the shuttle vehicles as working through similar principles of maglev. The typical vehicle is cylindrical in shape, with a hollow cylinder in the middle to embed a magnetic monorail.
Cross section schematic of an operating vehicle: 
The above mechanism allows a vehicle to rapidly move between two buildings, but since there cannot be end-to-end connections between every pair of inputs and outputs rails in a single building, a vehicle travelling A -> C -> B would need to decelerate when approaching C, then slowly route to the C-B rail and accelerate again. This greatly reduces transportation speed at junction buildings. To minimize the disruption of reentering rails on highways, I introduce a special "junction" functional building highly optimized as redirection nodes on a highway route.
A junction is a spherical building with an arbitrary number of corridors. Fluid ducts between corridors are connected through inner layers on the spherical wall. Meanwhile, all rails pass into the large hollow cavity in the junction center
When a vehicle enters the junction cavity, the rail does not exert any braking force on it. Instead, a strong magnetic field is formed along a diameter of the cavity that redirects the orientation and velocity of a vehicle so that it perfectly tilts to enter the next rail, preserving $\max(\cos\theta,0)$ of its original speed. In the case of highway routes with a single dominant input and output corridor, multiple vehicles can move through the junction at the same time by applying the magnetic field in the same direction.
Does this mechanism sound practical? It feels very dangerous and unreliable to apply a magnetic force to precisely "aim" a very fast vehicle into a small guideway rail. In particular, can we reasonably apply the right amount of magnetic force to multiple vehicles with varying mass/CoG/moment even though they are moving from and to the same pair of rails?
