Subject:
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Re: Canadian National SD40-2 Diesel Engine V2
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Newsgroups:
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lugnet.trains
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Date:
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Thu, 10 Oct 2002 18:09:36 GMT
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Viewed:
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1321 times
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In lugnet.trains, John Neal writes:
> Anyone can build a choo-choo, and make it anything they want, and call it
> anything they want. But if they decide to make a *certain* choo-choo, then
> they must build in certain elements that are elemental to that certain
> choo-choo. Wheel configuration is about as elemental a discriptor for a
> locomotive as you can get.
If it was anyone else posting the above I'd let it go.. or just post a "yep,
well said" because most of the points are valid. BUT, since apparently J2 is
identifying himself as a nitpicker, I have to point out that there is almost
certainly a prototype for a 6 axle (as built locomotive) on 4 axle trucks...
somewhere. It is not impossible to retruck something although it is a lot of
work because of the wiring to the traction motors and the motor blower ducts
etc, etc. that all need to get rerouted.
But not all 3 axle trucks have 3 motors. Some are A1A trucks with an idler
center axle and have only 2. I am pretty sure I've seen pictures of some
loco originally built as an A1A-A1A riding on B-B trucks.
As to WHY there are 4 axle and 6 axle units in the first place, it has to do
with axle loadings, motor ratings (tractive force), the maximum traction
that a single motor can transfer to the rails via a single axle and two
wheels, and a host of other factors, although if the Canadians want to think
it's because they're special, that's OK too. :-)
++Lar
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Message has 5 Replies:
 | | Re: Canadian National SD40-2 Diesel Engine V2
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| With my SD40-2 (Rio Grande) I kind of took the middle road and put 6 wheels in the back and used the 4 wheel train motor in the front. I know it's not exact, but we do have to work with in the limits of LEGO parts. I did try match the fans and side (...) (22 years ago, 10-Oct-02, to lugnet.trains)
| | | Re: Canadian National SD40-2 Diesel Engine V2
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| (...) GMD1's. (URL) at least some GP's and SD's have also changed over...most likely SD's to GP's. There isn't _that_ much of an advantage of such a change though, because a 6 axle loco can be used for the most part interchangeably with a 4 axle (...) (22 years ago, 10-Oct-02, to lugnet.trains)
| | | Re: Canadian National SD40-2 Diesel Engine V2
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| (...) Interesting challenge. I would be willing to bet that there isn't an example for the reasons you stated and others. It would certainly *look* odd, with large gaps from truck to steps and so on. Let's bet lunch on it and keep an eye out for (...) (22 years ago, 10-Oct-02, to lugnet.trains)
| | | Re: Canadian National SD40-2 Diesel Engine V2
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| (...) I've seen weirder... A Henschel prototype built in the late seventies was converted from Co'Co' (2 bogies, 3 axles each. 3 motors/bogie) for Dutch Railways into the type 3'1A1' (that's two bogies with 3 axles each. Only one motor, driving the (...) (22 years ago, 10-Oct-02, to lugnet.trains)
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Message is in Reply To:
| | Re: Canadian National SD40-2 Diesel Engine V2
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| (...) I don't think it will ever come, and I hope it never comes, and here's why: To design a 6 wheeled truck, you need to make the spacing between the wheels pretty short in order for the truck to negotiate the tight LEGO track curves, a la the 12 (...) (22 years ago, 10-Oct-02, to lugnet.trains)
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