Jerry474 Wrote:
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> My earlier statement....The running gear, pony and
> trailer trucks on the K-37s are the same as the
> K-36s. The D&RGW used the K-36s drawings to build
> the 37s...was only partially correct. Following is
> from my D&RGW notes.
>
>
> DENVER & RIO GRANDE WESTERN RAILROAD
> Alamosa, Colorado
> October 17, 1946
> Mr. L. H. Hale:
>
> Your letter of October 16th, File 2, comparing
> action of 490 class engines in Marshall Pass
> territory with Cumbres territory, also if any
> trouble on Monarch Branch.
>
> We have had trouble with engine trucks derailing
> both 480 and 490 class engines in Alamosa-Durango
> territory, also with 470 class engines when track
> conditions were the same as they are now on east
> side of Marshall Pass, namely curves slipping out
> of line due to moisture in ground. The last
> derailment of 480 class engine truck to my memory
> in Alamosa-Durango district was Engine 481 in
> Monero Canyon and apparently was due to high
> degree curve out of line to the extent roller
> swing bearing dislodged from normal fit and laid
> on side in a position it did not return to normal
> fit when curve changed back to proper degree
> further around the curve.
>
> Engine trucks, rods, and other machinery are
> interchangeable on both engines, except trailers,
> and trailers on 490 class are the same as 470
> class engines.
So... is a 470 trailer truck the same as a 490? I had never thought of that. It is hard to believe the two so dissimilar engines would have the same trailer truck, even if they are of the same basic design.
However, according to the folio sheet, a 470 has the same distance from last driver to trailer axle - 108" as a 490.
Personally, I have never seen either a 470 or a 490 trailer out from under an engine. So I can't tell you if they are the same.