"Warp" is not a completely accurate description of what happens when an early 700E casting degrades due to zinc pest. What's actually happening is that the casting tries to expand in all directions as it degrades. This is evident on a 700K cab in my collection that had never been mounted to a frame. It's larger in all dimensions, and will no longer fit on a 700E frame, but there is no warp. Another indicator of expansion on bad cabs is that the solder joints on the thin rods running forward from the engineer's side of the cab to the front of the engine are broken, with quarter-inch gaps where the joints had been.
At train shows here in Colorado, Don Hagar used calipers on the running boards of 700E's and 763E's to determine how much expansion there had been.
The warping that's commonly observed in cabs and in frames is because the cab has been mounted to a frame that has not expanded (or, at least, has not expanded at the same rate). The expansion of the cab, but not the frame, is what causes the "cow catcher" to be pushed downward onto the track.
Is your frame warped? Or is it the cab that’s warped? If your cab is good and your frame bad, I can check to see whether I have a spare frame. (I know for sure I don't have any spare cabs.)
