route is 13.50 miles, of which about 2 miles are on viaduct.

Another route begins at Broadway near 103d Street and extends under
104th Street and the upper part of Central Park to and under Lenox
Avenue to 142d Street, thence curving to the east to and under the
Harlem River at about 145th Street, thence from the river to and
under East 149th Street to a point near Third Avenue, thence by
viaduct beginning at Brook Avenue over Westchester Avenue, the
Southern Boulevard and the Boston Road to Bronx Park. The length of
this route is about 6.97 miles, of which about 3 miles are on viaduct.

[Illustration: MAP SHOWING THE LINES OF THE INTERBOROUGH RAPID TRANSIT
CO. 1904]

At the City Hall there is a loop under the Park. From 142d Street
there is a spur north under Lenox Avenue to 148th Street. There is a
spur at Westchester and Third Avenues connecting by viaduct the
Manhattan Elevated Railway Division of Interborough Rapid Transit
Company with the viaduct of the subway at or near St. Ann's Avenue.

[Sidenote: _Brooklyn Route_]

The route of the Brooklyn Extension connects near Broadway and Park
Row with the Manhattan Bronx Route and extends under Broadway, Bowling
Green, State Street, Battery Park, Whitehall Street, and South Street
to and under the East River to Brooklyn at the foot of Joralemon
Street, thence under Joralemon Street, Fulton Street, and Flatbush
Avenue to Atlantic Avenue, connecting with the Brooklyn tunnel of the
Long Island Railroad at that point. There is a loop under Battery Park
beginning at Bridge Street. The length of this route is about 3 miles.