The definitions in this section apply throughout this chapter unless the context clearly requires otherwise.

"Car width" means twice the distance from the centerline of the car to its extreme outside part.

"Commission" means the Washington utilities and transportation commission.

"Icing platforms" means structures used in performing the service of icing, precooling, heating, ventilating and servicing of cars used in the handling of commodities requiring those services.

"Overcrossing" means any point or place where a highway crosses a railroad by passing above it.

"Overhead clearance" means the distance measured along a line which is perpendicular to and joins a horizontal plane passing through the top of the highest rail and a horizontal plane passing through the lowest point of the overhead structure or obstruction.

"Side clearance" means the shortest distance from centerline of track to a structure or appurtenances such as downspouts, ladders, or other obstructions at the side of the track.

"Track clearance" means the shortest distance between the centerlines of adjacent tracks.

"Walkways" means pathways located alongside or in the vicinity of a railroad track, or on a trestle or bridge, that provide an area for a railroad employee to perform duties associated with the track, trestle or bridge.