Hidden third rail streetcar?

General discussion of passenger rail proposals and systems not otherwise covered in the specific forums in this category, including high speed rail.

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Hidden third rail streetcar?

Postby STrRedWolf » Sun Apr 10, 2016 8:35 am

Isn't there a streetcar system that has a hidden third rail along the middle of the track, and the power is induction? I thought DC Streetcar was that but it's using regular catenary line.
I ride the (MTA Maryland) Penn Line (between Odenton and Baltimore). I used to work for MTA Maryland's IT department, and out of professional courtesy my responses may be limited. Wikimapia is wonderful (for track/interlocking locations)!
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Re: Hidden third rail streetcar?

Postby mtuandrew » Sun Apr 10, 2016 11:17 am

The former DC system (Capitol Transit and DC Transit, plus their forerunners) used hidden third rail conduit (see https://en.wikipedia.org/wiki/Conduit_c ... collection, hybrid systems) but the current system uses overhead catenary.
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Re: Hidden third rail streetcar?

Postby ExCon90 » Sun Apr 10, 2016 2:31 pm

There is a newbuild system in Bordeaux (3 routes), where the city authorities didn't want overhead wires in scenic or traditional areas, particularly on the bridge over the Garonne. The third rail is flush with the pavement and only energized when a car is actually over it; I don't know whether it's by induction or actual contact with a shoe. There were some bugs, but they seem to have been straightened out.
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Re: Hidden third rail streetcar?

Postby dowlingm » Sun Apr 24, 2016 8:05 pm

The Bordeaux system is Alstom's APS.
http://www.alstom.com/products-services ... er-supply/

Bombardier has a system called PRIMOVE which uses induction. I think there is at least 1 or 2 others.

The problem for me with these systems is the implied vendor lock-in.
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Re: Hidden third rail streetcar?

Postby Myrtone » Sun Jun 26, 2016 3:23 am

The solution to the problem of vendor lock-in is the licence the power supply technologies out to other manufacturers.
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Re: Hidden third rail streetcar?

Postby Ken W2KB » Sun Jun 26, 2016 7:20 pm

Myrtone wrote:The solution to the problem of vendor lock-in is the licence the power supply technologies out to other manufacturers.


Why would the owner of the technology not want to keep the monopoly for the life of its patent? It can leverage the patent to be the sole-source vendor.
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Re: Hidden third rail streetcar?

Postby Myrtone » Sun Jun 26, 2016 7:54 pm

Because that might discourage others for adopting this system.
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