The overhead third rail was meant to bridge the gap across very long switches in the terminal- especially for short engines like the S-motors. The NYC electric locos had short fixed pans. The NH FL9 as-built had a small retractable pan (retractable so it wouldn't accidentally make contact with NH's 11,000v AC catenary, no doubt)... but from what I hear the timing to raise and lower the pan within GCT was guesswork at best- and often resulted in a shower of sparks and third rail pulled off the ceiling!
If you look in the GCT tunnels today, over very long slip switches and the like, you can see the pathways where overhead third rail was attached- but from my last observations, I saw no third rail mounted to the ceiling.
NYC employed a similar "overhead" third rail system within Detroit Michigan Central Station. The Detroit Tunnel was third rail electrified, but from what I understand, the third rail was mounted on scaffold overhead within the limits of the passenger platforms- for obvious safety reasons.
Western New York Railway Historical Society has a Niagara Junction E10B in its collection, stored in the elements in South Buffalo. A Dutch said, this E10 never came East to MTA. All of the E10B's that were on MN were cut up in November 2004. They were designed to run off of 600v DC trolley wire (trolley wire NOT catenary). When those units came to MTA, I heard the rooftop pan was deactivated and nullified to prevent accidental contact or damage within GCT.
-otto-
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