a railroad, the Hudson (later West Side) Line, running from the current Hudson Yards area between 30th and 32nd Streets south to Chambers Street. At the time, the city prohibited steam locomotives from operating below 30th Street because of the risk of the train's steam boiler exploding, so passengers from points north were forced to switch to horse-drawn trains. The horse-drawn line's stops were located at 23rd, 14th, Christopher and Chambers Streets. The West Side Line caused so many accidents between freight trains and other traffic that the nickname "Death Avenue" was given to Tenth and Eleventh Avenues. In 1929 the city, the state, and New York Central agreed on the West Side Improvement Project, a project that eliminated 105 street-level railroad crossings and cost more than US$150 million (about US$ today). A viaduct, the High Line, replaced the street-level tracks and was dedicated on June 29, 1934. The growth of interstate trucking during the 1950s led to a drop in rail traffic throughout the United States, and the viaduct was effectively abandoned in 1980. The Twenty-third Street Railway, a street railway originally operated as horse cars and later electric traction, was chartered on January 29, 1872. In 1893, the Twenty-third Street Railway was leased to the Houston, West Street and Pavonia Ferry Railroad, which in turn was consolidated into the Metropolitan Street Railway on December 12, 1893. The Metropolitan Street Railway was leased by the Interurban Street Railway on April 1, 1902, and the latter went bankrupt six years later. The Metropolitan Street Railway separated on July 31, 1908, becoming the 23rd Street crosstown bus route. Originally called the M18-15 and then the M26, the route was renamed the M23 in 1989. During the 1870s, the Sixth Avenue Elevated was built, significantly increasing the number of customers who shopped at stores along the route. Elevated lines with stations on 23rd Street were also constructed along Ninth Avenue in 1867, Third Avenue in 1878, and Second Avenue in 1880. By the middle of the 20th century, they were all demolished. Several New York City Subway stations now serve 23rd Street (see ). In 1869, Pavonia Ferry opened a terminal on the shore of the Hudson River at Pier 63, which aligned with the western end of 23rd Street. The ferries traveled to Jersey City, located opposite Manhattan. By the beginning of the 20th century ferries were already aging and deteriorating