Talk:Hybrid train

Steam diesel hybrid locomotive

I came upon this article while looking for Steam diesel hybrid locomotive. As this page deals with current technologies, it wouldn't be appropriate to slip in a short paragraph and linking with a {{main}} tag. It's in the "see also", however. To assist users looking for the bygone technology, I'm considering replacing the "see also"link with a hatnote redirect. Views? --Old Moonraker (talk) 10:33, 31 January 2009 (UTC)

Sounds reasonable to me. Biscuittin (talk) 10:01, 26 February 2009 (UTC)

Hybrid railcars and multiple units

I am putting Hybrid railcars and multiple units in Category:Hybrid locomotives for the moment. It may be appropriate to create a separate category for them when they become more numerous. Biscuittin (talk) 17:56, 25 February 2009 (UTC)

I cannot now see any railcars or MUs in that category, although the Japanese KiHa E200 is a Multiple Unit (albeit single car). It does beg the question, however, as to whether "Hybrid Train" should cover locomotives, DMUs, and however one would categorise the 'Hayabusa' Hybrid HST experiment Hybrid High Speed Train unveiled, or whether eg Hybrid Locomotive should be a separate article. --Tim PF (talk) 18:32, 4 December 2010 (UTC)

London Underground battery-electric locomotives

I don't regard London Underground battery-electric locomotives as hybrids because they don't have a prime mover. Biscuittin (talk) 21:06, 25 February 2009 (UTC)

The same comment applies to the Kennecott Copper locomotives. Do straight electric/battery locos count as hybrids? Biscuittin (talk) 09:59, 26 February 2009 (UTC)

If so, we could also include British Rail Class 419. Biscuittin (talk) 10:04, 26 February 2009 (UTC)

Yeah, I only added the LUL battery locos because of that Kennecott locomotive note. There's also the British Rail Class 70, British Rail Class 71 and British Rail Class 74 sets which use booster motor-generator sets. Though to me, a hyrid would be a train that can store regenerative-braking energy... do we have a good external citation to reference? —Sladen (talk) 18:02, 26 February 2009 (UTC)

Ultracapacitors

I wanted to correct the article to include ultracapacitors, something like: "... the storage system can be electric traction batteries, ultracapacitors, or a flywheel". After an extensive Web search, however, I cannot find an existing design:-( I can find theoretical papers to such rail vehicles (eg UltraCaps win out in energy storage -- Diesels can also benefit), and plenty of links to actual diesel-electic ultracapacitor hybrid buses, but that's not an actual rail vehicle. I'd still like to change the article to add it as a theoretical possibility, but I'm not sure how best to do it without a significant change to the article. Any ideas? --Tim PF (talk) 18:19, 4 December 2010 (UTC)

Expert Attention Requested

I was using this article as a source while discussing hybrids, and a friend who used to be in the industry informed me that regenerative braking had been in use while he was working, circa 2001, and is much more widespread than this article suggests. In addition, it looks like most of the substantive material is out of date, speaking of things that are under development as of several years ago. 98.220.239.48 (talk) 23:01, 4 February 2011 (UTC)

You appear to be confusing this subject with that of electric locomotives and EMUs which can use regenerative braking to return power back into the overhead lines or third rail system, where the energy is used by other nearby trains or (for example with 25 kV AC railway electrification in the UK) back into the main supply grid, which is indeed relatively old technology (ie over a decade).

I have indeed checked out the extent of hybrid train technology, and as far as I can see this article reasonably reflects the current state of play. On-board rechargeable energy storage systems are fairly rare in any rail vehicles, and are mostly on electric trams (often used to bridge short non-electrified sections). Bombardier Voyagers use electric braking, but dissipate the energy into roof mounted resistor packs; if they used the energy to charge up a battery pack or ultra-capacitors, they would indeed be hybrid trains.

I am removing the {{Expert-talk}} tag from the article. Please feel free to reinstate it if you can also cite some specific examples of the use of regenerative braking into RESS or other reasons why most of the substantive material is out of date. Tim PF (talk) 13:56, 5 February 2011 (UTC)

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