Two different trucks?

[BNSF_GP60M]

I was looking around on the internet today and I came across a picture that puzzled me. It of UP 9221, a C40-8 that has two different types of trucks underneath it. Why would UP put different types of trucks and what type of truck is it?

 http://www.vtwi.org/040208Carlisle/UP9221.jpeg

[J. Edgar]

as a guess.....id say that it was either wrecked or otherwise repaired and whatever truck they had on hand was used......or...someone at GE's quality control was nappin

[CSSHEGEWISCH]

He's obviously never seen an FL9 or a passenger C-Liner

[BNSF_GP60M]

He's obviously never seen an FL9 or a passenger C-Liner

 I have seen FL9s and C-Liners. I know they had different trucks because of weight like the FL9. And C-Liners had what was it like 16 different variations. They had good reasons for 5 axle trucks but this is different. Does it look like a Dafasco truck?

[oltmannd]

I was looking around on the internet today and I came across a picture that puzzled me. It of UP 9221, a C40-8 that has two different types of trucks underneath it. Why would UP put different types of trucks and what type of truck is it?

 http://www.vtwi.org/040208Carlisle/UP9221.jpeg

GE used to source their truck frame castings from General Steel Castings and Adirondak (at least I think I have'm right...)  They produced identical products in terms of form-fit-function, and, although they were not identical in design, they are completely interchangable.  The link shows one of each kind on the C40-8. 

Whether the C40 came this way from Erie as a result of traded-in truck frames or UP played mix-n-match in one of their shops is hard to say, although I find it hard to believe GE would have shipped it this way.

[Kootenay Central]

.

[J. Edgar]

CP 'Unmatched' the Trucks beneath some of their Alco Switchers in the Fifties. Never did find out why.

 http://www.mountainrailway.com/Roster%20Archive/CP%207000B/CP%207011.htm 

 http://www.mountainrailway.com/Roster%20Archive/CP%207000B/CP%207012-2.jpg

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ALCo s-1 switchers came with Blunt type trucks (under the cab in the first photo) the AAR type  A truck in the front replaced the Blunt truck on ALCo switchers at some point....so again were back to outshopping causing to use what ever fits on hand

[trainfan1221]

The UP photo shows an engine obviously rebuilt with the older alternate style truck GE had some years back.  They are easy to spot because of the unique appearance and the ridge over the center axle.  Oddly, the U34CH model built for EL had the regular trucks except for one, forgot which it was, that had the style of truck on the rear of the UP engine.  Kind of weird to see one on modern power, if a -840c is modern anymore.