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[CSSHEGEWISCH]

QUOTE: Originally posted by rgroeling

Its Chris again. Have any idea as to the practical purpose of a fully coweled locomotive, such as an F45??

Thanks!

One theory has been to provide an enclosed area for enroute troubleshooting. This would especially make sense on BN and the Canadian carriers.

[Anonymous]

I am still looking for a good reference (web or dead tree) which gives information on the various locomotive trucks - Blomberg, HTSC bolsterless, AAR, etc. Know any right off hand?

[dthede]

QUOTE: Originally posted by M636C

Larry,

As you probably know, the standard locomotive wheel is 40" diameter. The notice draws attention that the SD70M in question was built with 43" wheels (which would very slightly reduce the tractive effort). The "witness groove" is a mark turned in the face of the wheel at 38" diameter (in this case). It is there to indicate wear, and as a mark to indicate the limit that the wheel can be turned down to in a wheel lathe when machining to correct the profile of the wheel for wear.

Peter

UP #4163 is an SD70M with 42" wheels and 38" witness groove, so there is apparently a series with 42" wheels.
Didrik