Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Object Groupings and Systems (hierarchy name)
4. systems (equipment)
5. [systems by function]
6. infrastructural systems
7. transit systems (infrastructure)
8. public transit (infrastructure)
9. [public transit by form]
10. rail transit systems

Anotations

Scope note:

Railway systems employing a single rail either above or beneath the railway cars. Monorail systems first appeared in the early 20th century and have usually been propelled by conventional electric traction motors. Railway systems employing a single rail either above or beneath the railway cars. Monorail systems first appeared in the early 20th century and have usually been propelled by conventional electric traction motors.