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Nostalgia & History > NYC GP9 question

Date: 11/29/21 17:22
NYC GP9 question
Author: NYCStL776

What is the appliance visible just behind the cab in this photo? 

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Date: 11/29/21 17:47
Re: NYC GP9 question
Author: CPR_4000

IIRC it's a motor-generator set that has something to do with the ATS system.

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Date: 12/27/21 12:27
Re: NYC GP9 question
Author: SilverPeakRail

Like most railroads would do, the NYC probably salvaged the ATS equipment off of steam locomotives.  The turbo generators on steam engines were 32 Volt devices, so the ATC equipment was made for that voltage.  Diesels produce 64 Volts for lighting and control, so the simple way to use the old equipment was to provide a motor-generator to make current for the ATC.  

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