Physically located on or upon railway tracks or rails; literally positioned atop the metal rails used by trains.
Placed or lying on railroad tracks in a manner that involves direct contact with the rails (e.g., sleeping, walking, or performing actions on the tracks).
2.
UKUSGlobalneutralinformal
Traveling by train or being aboard a train; engaged in railway transport.
Situated on or very near the railway infrastructure as part of travel or transport.
3.
UKUSGlobalfigurativeinformal
Functioning properly or following the intended course; on track.
Back in order after a period of disorder; restored to normal or expected operation.