orbit, trajectory, (railroad) track...

model, standard, pattern...

tire track, traces of a person or thing, path one has taken...

rut, wheel track, distance between two wheels...

normal course (of action), proper course, regular way

rail (of a railroad)

(railroad) gauge

narrow gauge

broad gauge

lawlessness, violation of customs

orbiter

road-rail vehicle (vehicle which can travel both on railroad tracks and normal roads)

orbital plane

in orbit

railway line, tramway line

track-maintenance car, inspection car

course correction, trajectory change, orbital adjustment

orbital electron

orbital function

railroad track gauge

orbital motion

orbital resonance

orbital mechanics

orbit insertion (e.g. a satellite), orbital injection

circular orbit

cog rail

heavy rail

trackless, reckless, dissipated

to be on track, to be going to plan, to enter orbit

ICO, Intermediate Circular Orbit