page_title: Pacific Electric Railway Company Substation No. 8
hierarchical_section_title: Pacific Electric Railway Company Substation No. 8
caption_attribution_description: English: Pacific Electric Railway Company Substation Number 8, Altadena, California, USA
context_page_description: Electric interurban and trolley cars required 600 volts direct current to operate a car's Direct Current traction motors. The function of a "substation" was to convert very high voltage alternating current from a power generating plant for an AC to lower voltage DC conversion. The high voltage AC entered the substation, was dropped in level by a transformer, and the resulting lower voltage AC was then fed to a device called a Rotary Converter for the conversion to 600 volts DC. Substations existed on every trolley and interurban line in the United States and often still do for today's subway and light rail lines although the very large and cumbersome rotary converter, as much as eight feet in diameter and rotating, has been replaced by solid state converters.
caption: Pacific Electric Railway Company Substation No. 8
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