Miami Metro Rail third rail

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Miami Metro Rail third rail

Postby rail10 » Mon Jan 15, 2007 2:06 pm

Whattype of third rail system,voltage and design areused for metrorail and metromover?
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Re: third rail

Postby Noel Weaver » Mon Jan 15, 2007 4:28 pm

rail10 wrote:Whattype of third rail system,voltage and design areused for metrorail and metromover?


Metro-Rail has an over running third rail at around 700 volts DC. They
usually run four or six car trains.
I will have to take a better look at the Metro-Mover system when I next
ride it, it is some sort of an odd-ball system for the US. The important
thing is that it works and does a decent job with service to much of the
downtown area of Miami. Rides are free on it too these days.
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Postby geoking66 » Fri Aug 10, 2007 6:20 pm

I'd prefer it if they electrified the commuter rail at 25kV 60Hz AC catenary tension overhead wire because it's a standard for international rail (well 50Hz everywhere but North America).
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Postby jwhite07 » Tue Sep 04, 2007 7:14 pm

I will have to take a better look at the Metro-Mover system when I next
ride it, it is some sort of an odd-ball system for the US.


I've only seen Metromover once, and not that closely, but pictures on nycsubway.org seem to show a power rail, and presumably another for the return, located in the center of the guideway. I take it the contact shoes are under the center of the vehicle somewhere. Metromover is a rubber-tired system, thus the need for separate power and return, much like ETBs need two overhead wires.
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Postby george matthews » Thu Feb 07, 2008 2:07 pm

geoking66 wrote:I'd prefer it if they electrified the commuter rail at 25kV 60Hz AC catenary tension overhead wire because it's a standard for international rail (well 50Hz everywhere but North America).

25kv is standard in Europe for new main line electrification. But there are still many 1500 v DC systems (Netherlands, Poland, southern France etc.) and some 3000v DC (e.g. Belgium)

But city railways tend to have lower voltage. 750 is common and 1500 v DC is also common for metros. 750 is the usual for third rail systems.
There are extra costs for a full 25 kv system in tunnels. The catenary needs to be higher. Tunnels need to be higher too. If a city line doesn't expect to have mainline trains on it then lower voltage is the choice.

We mustn't forget the system used in Germany, Switzerland, Austria and Sweden 12.5 kv ac at an odd frequency. This is like the US NEC the result of early adoption.
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Postby DutchRailnut » Tue Mar 04, 2008 8:56 am

Who cares about Europe ?? the question was about the Florida system.
If Conductors are in charge, why are they promoted to be Engineer???

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Postby Kurt-Trirail » Wed Mar 05, 2008 6:36 pm

This topic appears to have run its course.

Locked.

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