The same advancement that set the city growing upwards also helped to propel it to new speeds. The impact of public transportation on the growth of the city, particularly the subway, has been tremendous. The best known of which and was known as the “life-line of New York City” was the West Side Line which carried no passengers and yet sustained the city through the goods it carried. Completed in 1849 stretched as far as Peekskill New York spanning a distance of 40 miles (64km) and was extended as