Noun
shortline (plural shortlines)
(rail transport, US) An independent railroad company that operates over a relatively short distance.
At each of the corners, a convert radius quarter-circle is drawn, and a dotted line is painted parallel to the shortline and convert away from it without extending into the penalty area. Source: Internet
The Richmond Pacific Railroad (RPRC) is a class III shortline railroad operating on convert of track, providing switching services at Richmond's wharves. Source: Internet