It be that too. A friend has worked for the railroad for 35 years and he says it's steel on steel and the diesel electric motors.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Michael Madigan Sent: Monday, August 02, 2010 5:38 PM To: ProFox Email List Subject: Re: [OT] unaffordable at any speed My physics teacher in high school said he thought the efficiency advantage came from the diesel engine operating at it's most efficient RPM. An electric motor is 90% efficient, a combustion engine is about 30% efficient, but can even have lower efficiency at too low or too high RPMs. --- On Mon, 8/2/10, Leland Jackson <[email protected]> wrote: > From: Leland Jackson <[email protected]> > Subject: Re: [OT] unaffordable at any speed > To: "ProFox Email List" <[email protected]> > Date: Monday, August 2, 2010, 6:21 PM > On 08/02/2010 04:55 PM, Stephen > Russell wrote: > > On Mon, Aug 2, 2010 at 4:42 PM, Leland Jackson<[email protected]> > wrote: > > > > > >> Most trains are still powered by diesel, > especially freight trains or > >> train that haul truck beds. > >> > > -------------- > > > > Nope. The power that spins the wheels on a > freight train is from > > battery. Those are recharged from diesel motors, > but the train is an > > electric motor powered beast. > > > > I'm sure there is reason for using this type of system, > whereby a diesel > engine is used to generate electricity, which is stored in > batteries for > later use in an electric engines, but it seem a bit > inefficient to me. > I guess the diesel engine and electric engine are in > operation > simultaneously. Perhaps it operates more like the > hybrid car. I vote > for a perpetual motion machine to run our cars LOL , > but that violate a > few law of physics: > > #---------------------------- > Excerpt: > > The lure of perpetual motion has always attracted > inventors, and despite > the universal scientific view that they are impossible, > many people > still try to build perpetual motion machines. The > most commonly > contemplated type of perpetual motion machine is a > mechanical system > which (supposedly) sustains motion indefinitely, despite > losing energy > to friction and air resistance. This violates the > first law of > thermodynamics, (eg conservation of energy). > > A second type of perpetual motion machine is one which does > not violate > conservation of energy, but produces work by extracting > heat from a > lower temperature source, (egEntropy), thereby cooling them > down > further, and converting the heat energy into mechanical > work. Such > machines are forbidden by the second law of > thermodynamics. > > http://en.wikipedia.org/wiki/Heat > > #--------------------------------- > > Regards, > > LelandJ > > > > > > > > > >> High speed passenger trains are electrically > powered. > >> > >> http://en.wikipedia.org/wiki/Train > >> > >> Trains in the USA are not a relevant today as they > were, say 50 years > >> ago. The vast majority of good in the USA > are now hauled by 18 wheelers > >> of which 9 out of 10 run on diesel. > >> > > ------------------- > > And how do you think the crap from China gets to > Chicago? Boat to > > Truck? hahahaha Boat to train > to truck is how it goes. > > > > One of the spouses in the church choir is a diesel > mechanic with the > > rail yard in town and told me that is how it is today. > I'll take it > > from the guy who fixes them over wikipedia. > > > > > > > > > > [excessive quoting removed by server] _______________________________________________ Post Messages to: [email protected] Subscription Maintenance: http://leafe.com/mailman/listinfo/profox OT-free version of this list: http://leafe.com/mailman/listinfo/profoxtech Searchable Archive: http://leafe.com/archives/search/profox This message: http://leafe.com/archives/byMID/profox/005a01cb3297$f67f27d0$e37d77...@[email protected] ** All postings, unless explicitly stated otherwise, are the opinions of the author, and do not constitute legal or medical advice. This statement is added to the messages for those lawyers who are too stupid to see the obvious.
