Many people do not know that the City Island - Pelham Bay Park area had a monorail from approximately July 17, 1910 (one trip only because the car derailed) and from October 1910 to March 16, 1914 between the Bartow station of the New Haven Rail Road and Marshall's Corner at the entrance to City Island. Original service to City Island was by horsecar but was eventually replaced by battery cars. Streetcar service to City Island ceased on August 9, 1919 and was replaced by buses Horsecars were still operating when the monorail stopped running. Battery cars operated from August 17, 1914 to August 9, 1919. Although the map does not show actual City Island streetcar trackage, it does shown other interesting features such as the railroads that ran through the area and other Bronx trolleys. I believe the horsecar and then battery car route was from the Bartow Station to the trip of City Island.
Please see this interesting map below. Other comments will follow in the future.