Show HN: I Wrote a Book on Evolutionary Algorithms with Python Notebooks https://ift.tt/3q9nVhA
Show HN: I Wrote a Book on Evolutionary Algorithms with Python Notebooks https://ift.tt/3mM0R7c November 27, 2020 at 10:09PM
Tracks in the Sky: Overhead Lines Then and Now
Tracks in the Sky: Overhead Lines Then and Now By Jeremy Menzies After telling you about the Track Department through the years , this month we take a look back at the Overhead Line Department. The focus of this group is to maintain our “tracks in the sky” which provide electric power to the LRVs, historic streetcars and trolley buses that are critical to keeping San Francisco moving. SF Municipal Railway Tower Truck No. 1 on Van Ness Avenue circa 1917. The earliest overhead transit power lines were built for San Francisco’s first electric streetcar line, which opened in 1892. As more electric streetcar lines came into service over the years, the electric grid above them expanded into a complex network requiring more power and more maintenance. Within 20 years, electric streetcars provided nearly all transit in the city. A complicated overhead line operation at Bryant and Alameda, 1951. The building on the right- built as a power generating plant in 1893 -was ...
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