Dr Zarkoff Wrote:
-------------------------------------------------------
> Yep. A chain is only as strongest as its weakest
> link, those chilled iron wheels.


Funny; my UP ETT's and accompanying Special Instructions
from the '40s say not one word about car wheels or what
they were made out of.

Except on some of the retainer grades where stops were
mandatory for 20 minutes at specified locations to cool
the wheels and inspect the train.