Are these two engines identical and made at the same time period in history?
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No they are not
They are very close but the cylinders are larger on the 1225. There are some cosmetic differences also. The 1225 was built in 1941 and the 765 in 1944
The NKP and PM were part of the Van Sweringen brothers railroad empire. Headquartered in Cleveland, Ohio, their empire consisted of the Chesapeake and Ohio, the Nickel Plate Road, the Pere Marquette and the Erie railroads.
The Vans set up an Advisory Mechanical Committee to standardize many of their various mechanical designs for locomotives across all four railroads. Thus the NKP, PM, C&O and Erie berks were all of the same fundamental design. However, they were not identical. Each railroad had its unique operational demands, so the basic design was modified slightly to suit the railroad involved.
Scroll down a bit at this link and theres a specification chart comparing the NKP, PM ,and C&O berks.
Rich
Have you ever been at the throttle of the 1225? If so how different is it then when your running the 765?
I have never had the opportunity to run the 1225.
Another big difference is the frame. 1225 rides on a fabricated frame and the 765 rides on a one piece cast steel bed. 1225 has no roller bearings. 765- the NKP S-2 Class - was built with roller bearings on the pony and driving axles. The 765's tender bearings were converted to rotating end cap roller bearings in 2010.
Thanks for the answers. Surprised the NKP went for less tractive effort than the other two. Was it a weight on drivers thing and more fragile track for the nkp?
It does seems kinda odd - the PM had no heavier grades than the NKP did.
