Marks whose codes end in U are used on containers that are carried in intermodal transport, and marks whose codes end in Z are used on trailers that are carried in intermodal transport.
Incorporated in 1823, the Delaware and Hudson Canal Company, which later became the Delaware and Hudson Railroad, built its first tracks in 1826 as a gravity railroad in Carbondale, Pennsylvania, to haul coal from a mine to the canal at Honesdale.
As early as the 1930s, automobile travel had begun to cut into the rail passenger market, somewhat reducing economies of scale, but it was the development of the Interstate Highway System and of commercial aviation in the 1950s and 1960s that dealt the most damaging blows to railtransportation, both passenger and freight.
He discarded the old wooden rail or stone stringer plated with scrap iron then in general use, and designed a crude but practical anticipation of the T-rail which, with slight variations in shape and modernization in size and weight, is still the standard design of railway tracks to-day.
The first lengths of rail for the pioneer line were received by ship from England early in 1831, and the first piece of track, five-sixths of a mile long, was laid during the summer of that year from Bordentown northwards, in the direction of Hightstown.
The rail was attached to the stones by a newly devised hook-headed spike, the forerunner of the spike now in general use.
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