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Samples in periodicals archive:
The Union Pacific contract calls for Harmon to furnish pre-wired housings, engineering, Harmon's Vital Harmon Logic Controllers (VHLC - microprocessor based interlocking controller), Electro Code-4 Track Circuit equipment and other required materials for installation on Union Pacific's suburban line in Chicago.
This design is used for the Vital Harmon Logic Controller, a multi-purpose solid state device for controlling railroad interlocking plants.
The project will utilize Harmon's Electrocode, Vital Harmon Logic Controller (VHLC), and HXP3 signal and wayside products.