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Re: Trolley Poles and Pantographs
Author: KRK
Date: 10-17-2015 - 20:22
KRK Wrote:
-------------------------------------------------------
> Joe Magruder Wrote:
> --------------------------------------------------
> -----
> > The Pacific Electric made frequent use of
> > cantenary, even on street running. My
> > understanding is that the pantograph wasn't
> > invented (by a Key System employee, by the way)
> > until after the PE's construction so shifting
> to
> > pantographs would have required rebuilding the
> > overhead to solve all of the problems discussed
> > elsewhere in this thread.
>
> The pantograph developed in the early 'teens by a
> Key System employee was the Brown Roller design..
> Looking at old photos and films of PE operations,
> including the "four tracks", I see primarily
> single-suspension trolley wire and NOT catenary.
> There was CATENARY, however, on San Pedro Street,
> which was dual guage, sharing space with the LA
> Railway.
>
> KRK
It was the Brown Roller Diamond pantograph :
The familiar diamond-shaped roller pantograph was invented by John Q. Brown of the Key System shops for their commuter trains which ran between San Francisco and the East Bay section of the San Francisco Bay Area in California.[4][5] They appear in photographs of the first day of service, 26 October 1903.[6] For many decades thereafter, the same diamond shape was used by electric-rail systems around the world and remains in use by some today.
The pantograph was an improvement on the simple trolley pole, which prevailed up to that time, primarily because the pantograph allows an electric-rail vehicle to travel at much higher speeds without losing contact with the overhead lines.
KRK
-------------------------------------------------------
> Joe Magruder Wrote:
> --------------------------------------------------
> -----
> > The Pacific Electric made frequent use of
> > cantenary, even on street running. My
> > understanding is that the pantograph wasn't
> > invented (by a Key System employee, by the way)
> > until after the PE's construction so shifting
> to
> > pantographs would have required rebuilding the
> > overhead to solve all of the problems discussed
> > elsewhere in this thread.
>
> The pantograph developed in the early 'teens by a
> Key System employee was the Brown Roller design..
> Looking at old photos and films of PE operations,
> including the "four tracks", I see primarily
> single-suspension trolley wire and NOT catenary.
> There was CATENARY, however, on San Pedro Street,
> which was dual guage, sharing space with the LA
> Railway.
>
> KRK
It was the Brown Roller Diamond pantograph :
The familiar diamond-shaped roller pantograph was invented by John Q. Brown of the Key System shops for their commuter trains which ran between San Francisco and the East Bay section of the San Francisco Bay Area in California.[4][5] They appear in photographs of the first day of service, 26 October 1903.[6] For many decades thereafter, the same diamond shape was used by electric-rail systems around the world and remains in use by some today.
The pantograph was an improvement on the simple trolley pole, which prevailed up to that time, primarily because the pantograph allows an electric-rail vehicle to travel at much higher speeds without losing contact with the overhead lines.
KRK
