pineywoodsman wrote:From enough reading I know that there was once a line that used to run south from Mineola to West Hempstead, and the Right of Way seems easily defined the whole route by power lines. But these do not look like the typical power lines LIPA (now PSEG) uses for regular transmission & distribution, and look more like those used by the LIRR and appear to be DC. They run south from the Mineola substation (by Nassau) down through Garden City. Looking at the poles it appears they're owned by the LIRR, perhaps so is the R.O.W. I'm not sure. I'm curious as to what power they carry. I've always assumed the RR has a dedicated feed from the grid for signals & 3rd rail, but that's not always easily visible. But I'm taking a wild guess they're using the former ROW to get power to Mineola from West Hempstead, where there's even larger substations.
Here's a google streetview of the poles I'm talking about, some appear to be quite old.
http://goo.gl/maps/d4gmG
And photos I took recently of the poles as they cross Old Country Road & head south.
Anyway I appreciate any answers...always been curious about this line. I'd love to see some old photos of when it was in operation.
What you see in these pictures, are in fact, railroad wires. But only on the bottom crossarm, the one containing 4 conductors. These are actually two separate, 2-leg circuits, about 2400 volts AC each, which provide power to railroad signal and speed control circuits at 25hz and at 100hz, respectively. They are maintained still, by the High Tension Department.
Who is this little known department, High Tension? They are (in simple terms), the equivalent of a very small utility company. They consist of about twenty highly trained linemen who build, maintain, and repair the overhead high voltage circuits on the railroad. Their main "customer" would be the Signal Department, who depend on them to provide the power for their signal apparatus, controls, and systems. They also maintain feeders for the Substation department, and high voltage circuits used to power various railroad buildings, facilities, and complexes.
Back to the pictures... Why do these particular wires run out here, on the public streets? Well, this used to be a right of way, where tracks once ran many years ago. These circuits are part of a redundant ring feed, which can be fed from multiple sources and locations to maintain quality, uninterrupted signal power, in the event of storm damage, etc... much like a regular power company.
Speakng of which, the upper crossarm with the 3 phase circuit on them is used and maintained by LIPA for regular residential/commercial power service. These poles are typically jointly maintained/repaired by the railroad and the local utility company.