- Steam Railroad on the surface (19th Century) Examples: Culver, West End, Brighton Lines
- Steam Railroad on elevated line in business areas (Late 19th Century), Examples, 3rd Avenue and 5th Avenue Elevateds in Brooklyn and perhaps the Myrtle and Broadway Els as well.
- Steam Railroad on elevated line extended to suburban areas such as the Coney Island Area via the above right of ways. (Examples: Culver, West End and Brighton Lines)
- Electrification of the the Elevated Lines and trolley wiring of their extentions on the surface (1890's to early 1900's). Trolley wire strung on Gravesend Avenue, Brighton Line Right of Way, New Utrecht Avenue (West End Line). Train cars had trolley poles and third rail shoes.
- Construction of the more modern elevateds with third rail and equipping private right of ways with grade separation and third rail power. (Around 1914: Modern Sea Beach, Brighton Line, Culver Line and so on.
- Running modern subway equipment on new elevated structure and private right of ways such as the Sea Beach Line and Brighton Line using third rail power.
- Former right of way under new elevated structures retained trolley wire and tracks and was served by streetcar type of service at ground level. (Example, around after 1916, such as the Gravesend Avenue (McDonald Avenue Trolley), West End Trolley under the West End El on New Utrecht Avenue).
- Abandonment of streetcar service under elevated structures. (For example, West End Trolley died in 1947, McDonald Trolley died in 1956.
- Abandonment of older elevated structures, such as the 3rd and 5 th Avenue Elevateds, Fulton Street Line, Lexington Avenue El (1940's to 1950). Section of the Culver El abandoned in 1975.
According to the material I presented, logic would say that this Sheepshead Bay Race Track spur was operated under trolley wire because the Brighton Line line was not redesigned for third rail operation until after 1912. Although not shown on the above diagram, there were two easterly tracks on the embankment that was stream railroad operated by the Long Island Railroad. Perhaps this spur was served by Long Island Railroad Stream trains? But I am not sure.
Note: The Neck Road station is presently on an embankment and probably was also prior to 1912.
Imagine a race track on Ocean Avenue?
More about this to follow: