Y Class rebuilding possibility

NW Mailing List nw-mailing-list at nwhs.org
Tue Mar 13 22:38:31 EDT 2007


The C&O 2-6-6-2's were NOT USRA design, but original C&O. Jim Nichols

NW Mailing List wrote:


> I finally pulled your(?) book; I'd forgotten about all the incremental

> changes going from the original Y5 to the Y6b. Even with all those

> changes, the real shift in overall layout was from the Y4 to the Y5,

> it seems. Some roads might have even classified the Y6s as additional

> sub-classes of the Y5.

>

> Could it be said that the Y6b was the last "big steam" loco built?

> Interesting that USRA or developed-USRA designs were 3 of the "last"

> steam locos built - Y6b; S1a, last Class 1 steam built and the C&O

> 2-6-6-2s the last ALCO steam built.

>

> pete groom

> On Mar 12, 2007, at 8:12 PM, NW Mailing List wrote:

>

> When the Y5s were built in 1930-32, they all had bar frames with

> cylinders bolted to the frames and the axles had friction bearings.

> When the Y6s were built, they got bed castings with integral cylinders

> as one unit, and the axles had roller bearings. Because of the success

> of the Y6s having more reliability and lower maintenance costs due

> the bed casting and roller bearings, it was decided to upgrade the Y5s

> by replacing the bar frames and cylinders with bedcastings and roller

> bearings similar to the the Y6. Thus the Y5 were "modrnized" and

> made equal to the Y6.

>

> Bud Jeffries

>

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