sidetrack (n.)
- avert
- branch
- bypath
- byway
- departure
- deviation
- digression
- el
- elevated
- embankment
- episode
- excursion
- excursus
- feeder
- gee
- glance
- haw
- jib
- junction
- line
- metro
- monorail
- rail
- railroad
- railway
- roadbed
- roadway
- shunt
- shy
- side
- sidestep
- siding
- subway
- switch
- terminal
- terminus
- track
- tram
- tramline
- trestle
- trunk
- tube
- turnout
- underground
