Since anon left before replying and you are too lazy to use google
"Death Avenue" was a nickname given to both Tenth and Eleventh Avenues on the west side of Manhattan, New York City in the 19th century.
In 1847, the City of New York authorized the construction of railroad tracks along Tenth and Eleventh Avenues on Manhattan's West Side. The street-level tracks were used by the New York Central Railroad's freight trains, which shipped commodities such as coal, dairy products and beef. For safety the railroad hired "West Side cowboys", men who rode horses and waved flags in front of the trains. However, so many accidents occurred between freight trains and other traffic that the nickname "Death Avenue" was given to Tenth and Eleventh Avenues.