In comic art, "speedline" is the standard jargon used to describe lines indicating the direction and velocity of motion. The lines are generally straight and parallel, to describe smooth linear motion, such as the path of a bullet, but they may also be curved to describe for example the swing of a baseball bat. The lines may also converge to a vanishing point according to perspective. Speedlines may taper off to indicate a short quick motion, or may extend across an entire panel to indicate continuous motion. Generally the length of speedlines indicates the range and duration of the motion, while the number of speedlines indicates the velocity. More speedlines generally suggest more velocity. Speedlines may be drawn in the background or the foreground as required.

The Hi-Speedline (or "Speedline", as it's commonly called) is a 14.2 mile rail line operating between Lindenwold, New Jersey and Center City Philadelphia, Pennsylvania. The Hi-Speedline has a total of 13 stations, 9 in New Jersey and 4 in Philadelphia:

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