Y Class rebuilding possibility

[NW Mailing List]

  ----- Original Message ----- 
  From: NW Mailing List 
  To: NW Mailing List 
  Sent: Tuesday, March 13, 2007 5:28 PM
  Subject: Re: Y Class rebuilding possibility


  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.

  The Y6s were the Y5 with improvements. The Y6s had the same capacity as the Y5 and their major improvment was the use of bed castings and roller bearings. The Y5s later got these improvements, also.

  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.

  The C&O engines were not direct descendents of the USRA but were a direct descendent from the C&Os H-2 of 1911.

  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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