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Apparently these were "limited production", only 3 were BTO for P&WV.

 

From Steam locomotive.com:

 

2-6-6-4 Type Locomotives

"Most if not all locomotive designs with four-wheel trailing trucks were the result of the desire for more power and the need for a bigger firebox. The 2-6-6-4 design was no different. In 1934 Baldwin constructed three of this wheel arrangement for the P&WV (Pittsburgh & West Virginia) who desired to increase the speed of their freight trains."

 

"This wheel arrangement was made most famous by the Norfolk & Western who perfected this design. The N&W had the most powerful 2-6-6-4s and used roller bearings on the axles. The last five were also equipped with roller bearings on the side and main rods!"

 

"High-speed articulateds generally were of two wheel arrangements -- the 2-6-6-4 and the 4-6-6-4. Baldwin was the primary builder of the 2-6-6-4 while ALCO was the primary builder of the 4-6-6-4. In the end, the 4-6-6-4 wheel arrangement became more popular".

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Ste 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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