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Battery trams

General Transport Discussion not specific to one state

Battery trams

Postby Myrtone » Sat Nov 10, 2018 6:42 pm

Here are the different types of electric rail vehicle:

*Traditional straight electric, which always runs where there is an overhead wire or a third rail. Although trolleybuses that are like this are no longer produced, many new trams are still like this, while newer trams, including Melbourne's Zs, As, Bs and all low floor trams, all have batteries to power accessories, apparently they aren't powerful enough to power traction motors, and I don't fully understand why. Batteries don't need much capacity to briefly power motors under neutral sections in the wires.

*Dual straight electric and battery electric which can use external electricity where there is an overhead wire or third rail but with batteries to power it on unelectrified track, and maybe even under neutral sections in the wires. While auxiliary power units and standard on new trolleybuses and at least one new trolleybus system (somewhere in Sweden) has an unwired depot, most new trams still don't have this, even if built for new systems, the depots on them still being wired.
Auxiliary batteries would also allow for gaps in overhead wires, such as under low bridges where the wires would otherwise have to be lower than elsewhere.
Or if a network is mostly off-street and street running sections are short, auxiliary batteries would allow third-rail electrification only on off-street instead of overhead power throughout

*There are also a few electric trams which run entirely on battery power just like other battery electric vehicles, and analogous to any that runs on a liquid or gaseous fuel. These all have a range limitation, just that the range of those running on a gas and especially on oil, have a much longer range between refuelling than battery electric vehicles have between recharging.
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Re: Battery trams

Postby rogf24 » Mon Nov 12, 2018 1:41 pm

The Newcastle tram will be battery powered. Ok, not battery as in li-ion but supercapacitor with flash recharges at stops. They're like a battery but can hold much more charge but doesn't hold its charge for very long, hence the need to flash recharge frequently.
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Re: Battery trams

Postby tonyp » Tue Nov 13, 2018 2:30 am

rogf24 wrote:The Newcastle tram will be battery powered. Ok, not battery as in li-ion but supercapacitor with flash recharges at stops. They're like a battery but can hold much more charge but doesn't hold its charge for very long, hence the need to flash recharge frequently.

Here are trams in Konya, Turkey running on batteries over a similar length to the Newcastle line but with in-motion charging, so doesn't need recharges at stops:

https://www.youtube.com/watch?v=hJL3c01Y59g
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