16th Avenue and 72nd Street New Utrecht Intersection: Altitude Error

The two maps shown below were produced in QGIS.  I brought in the contour file of altitude that I used before and I brought in the subway line file which shows the B train tracks over New Utrecht Avenue Brooklyn.  The vertical line that I mentioned in earlier posts crosses New Utrecht Avenue at 16th Avenue and 72nd Street.  In one map, I brought in the elevations and the elevation does not vary that much from 10 or 11 meters.  In the vertical error line, there is no variation as expected.  A  Google street view of the  area shows nothing unusual.

West End Line - South Portion Until 1916

Source:  Watson, Edward B. & Linder, B. "New York Division Bulletin", Vol. 22, No. 6, June, 1979, p.7.

This track map shows the layout during the days that 5th Avenue - West End Elevated trains ran on the surface in this part of Brooklyn.  Motive power for this section was overhead trolley.  Not shown on this map, but on the north section map, motive power from around 36th Street and 5th Avenue station and north to the Brooklyn Bridge was third rail power.

West End Trolley (Brooklyn) 1916-1947

Source:  Watson, Edward B. & Linder, B. New York Division Bulletin, Vol. 22, No. 6, June, 1979, pp.2-5.

   Since in a prior post, I showed videos of Brooklyn trolleys, some of which showed 39th Street Street and New Utrecht Avenue and Bay 19th Street, it is appropriate that I should show the streetcar line that ran at these locations.    The West End trolley, started its' life as a steam railroad line in 1864 and went through a similar progression as its' sister slightly to the east, the Culver Line.  The progression was:  Steam Railroad on the surface, electric elevated trains with trolley poles on the surface, steel structure with elevated /subway trains and trolley cars on the surface.  Like its' sister, the McDonald Avenue Trolley, the West End Trolley ended its' life (1947) even without the indignity of being replaced by a "stink buggy", also known as a diesel bus.