Y Class rebuilding possibility

[NW Mailing List]

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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