GE U30B 40" wheel diameter help

Re: GE U30B 40" wheel diameter help

Postby ConducTTor » Sun Sep 05, 2010 2:25 am

Marquette wrote:So now I'm getting really, really tempted to jump forwards in time to the mid/late 1960s! The Milwaukee ran the U30B, and I love the Milwaukee!

The Great Northern (U28B) and Northern Pacific (U28C) also ran various U-Boats, and as far as I understand, the U28s were fairly similar in appearance to the U30s, so I could model any of my three favourite northwestern roads!


They were pretty much the same. The only visible difference that I'm aware of is the engine bay doors - the 28s had six, the 30s had 8. Extremely easy to change on a CAD file. So I guess I'm doing both versions :thumbup:
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Re: GE U30B 40" wheel diameter help

Postby scaro » Sun Sep 05, 2010 6:21 am

i am not sure on the door thing, as i'd always understood that a late U28B and an early U30B were kind of hard to tell apart, or even indistinguishable.

kalmbach's 'second diesel spotters guide' used to be my bible, years back, but you know it could have been late U25B/early U28B, who knows? :?

this is supposedly a U28B and has 8 doors.

http://www.railpictures.net/viewphoto.p ... 47&nseq=19

are you sure the door thing isn't U18B - 4, U23B - 6 and above that 8 doors?

cheers

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Re: GE U30B 40" wheel diameter help

Postby Marquette » Sun Sep 05, 2010 11:28 am

Also, the early U28B and late U25B have virtually the same carbody - so essentially, with 2 designs you've got 4 loco types.
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Re: GE U30B 40" wheel diameter help

Postby ConducTTor » Sun Sep 05, 2010 2:40 pm

@ scaro - you're right. The U23s and U25s had a 12 cylinder motor and 6 doors. The U28 and U30 had a 16 cylinder and 8 doors.

@Marquette - you're right as well. And actually the whole family can be done. The 'c' versions where pretty much the same thing with the obvious bogie difference. If I find suitable parts for 6 wheeled trucks, there is no good reason not to do it.
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Re: GE U30B 40" wheel diameter help

Postby Marquette » Sun Sep 05, 2010 4:52 pm

I've just wrapped up a surge of research, gonna post it in a new thread, though... but it is relevant to this!
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Re: GE U30B 40" wheel diameter help

Postby scaro » Sun Sep 05, 2010 8:47 pm

ConducTTor wrote:@ scaro - you're right. The U23s and U25s had a 12 cylinder motor and 6 doors. The U28 and U30 had a 16 cylinder and 8 doors.



U25Bs and Cs had a 16 cyliner engine, the FDL-16, and eight doors. http://www.rrpicturearchives.net/showPi ... ?id=471203

despite the lower numbering, the U23B was from 1968, somewhat later than the U25B, and was something of a 'revision' in GE's loco evolution, a bit like the GP38 series was for EMD.

basically the railroads realised around this time that high horsepower wasn't that useful for all jobs (and turbochargers for high hp locos were expensive to maintain) and so the builders decided to offer a medium hp roadswitcher.

GE and GM both tried a 12 cylinder engine and turbo package (GP39 and GP39-2, and U23B), which was moderately successful for GE but didn't do that well for EMD, who found much more success by ditching the turbocharger and offering a normally aspirated 16 cyl engine (GP38, GP38AC and GP38-2).

a U23B has six doors, account the smaller 12 cylinder engine.

cheers, ben
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