One who holds himself out to the general public to transport property and passengers, intrastate, interstate or in foreign commerce, for compensation.
The vertical projection along the inner rim of a wheel that serves, in conjunction with the flange of the mating wheel, to keep the wheel set on the track, and provides the lateral guidance system for the mounted pair.
Goods being moved from one place to another by transportation lines.
The ratio of the vertical change in elevation of a line with its length. For example, a 3 percent grade is a rise of 3 feet in a distance of 100 feet.