Wednesday, November 07, 2007

Bzzz bzzz train

So here's a random thought. If batteries are almost powerful enough to power automobiles, why can't we use batteries to power trains, which many times as energy efficient? Instead of having an oil car back of the engine, you'd have a battery car. You could just change them out and have battery cars sitting on the siding recharging.

4 Comments:

Blogger Yoel Natan said...

A battery does not store enough energy by weight to make such a use practical. Gasoline stores 34 megajoules per litre, and look how weak batteries are in comparison:

Lead Acid Battery ........... 100 kJ/kg
Ni-Cd Battery ............... 200 kJ/kg
Alkaline-Manganese .......... 300 kJ/kg
Lithium ion Polymer ......... 600 kJ/kg

links:
http://earthnet-geonet.ca/activities/oil&gas/onelitre_e.php

http://donpmitchell.blogspot.com/2006/09/batteries-bombs-and-rocket-fuel.html

3:19 AM  
Blogger Octavo Dia said...

Anyway, before we start making electric cars, we should make electric trains.

3:43 AM  
Anonymous Anonymous said...

A subway train runs on electricity...

1:54 PM  
Blogger Octavo Dia said...

Subways run on direct power from rails or cables.

8:29 AM  

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