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Hubbell RMG in Rhode Island
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Yeah these were used on the freeways a little bit. I've never seen one on a truss pole before. I've only seen them before on davits. They're not common at all though. There are a couple of these (including this one) on Rte 138 at US 1 and on Rte 24 right near the Mass-RI line.
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When you meantioned the poles change on I-95, did you mean here in Warwick? Or did you mean here in Providence? on the short old davits I saw a 1982 picture and apparently they all originally had flatbottom Westinghouse OV-25s from 1957 (since that's when I-95 was opened). now they all have 250W HPS M-250R2s except for a couple 400W HPS newer M-400s that were just spot installed at a couple of sharp turns in the Providence area for more light.
Hmm I never knew there were lights on those tall round davits before the M-400R2s. I figured the M-400R2s were the originals. Now the lights are M-400R2s and newer M-400s. Some of the lights are relay controlled and other sections are photocell-controlled. I don't know why it's not consistant though. every mile stretch or so it alternates. i never knew they used HPS Westies here either. Were they the older round style silverliners or the later boxy "l-series" lights? Man it would have been awesome to have been around when there was such a variety here. There still is a good variety but nothing like what you describe!
i never saw the RLGs or ITT 25s on the very round davits. Were they HPS? If so i wonder why they changed them all to M-400R2s. as for the powerpacks, I'm guessing these are the poles? and yeah Joe Maurath's collection has many of the same lights that were used in RI and they mostly all work after 50+ years of dusk to dawn service. Very few but some even had their original lamp and photocell. those are among Joe's most prized lights.