Some years ago I began making postings from the Cumbres train registers. These postings covered the winter months of 1932, 1933 and 1937. Winter operations were my interest. While I was making the postings for 1932, Jimmy began sending me info off the dispatcher train sheets, and I included that info my postings, noting the source. He continued doing that while I was doing the postings for 1933 and 1937. Subsequently, Jimmy began doing postings himself from the trainsheets. This was a vast improvement over what I had been doing, as his postings covered the entire narrow gauge, while my postings were essentially a snapshot of activity at a particular location. Jimmy’s posting have been primarily the winter months into spring (he knows my interest). In 2009-10, however, he did postings from September 1944 into the spring of 1945, which covered the stock rush as well as winter operations.
As far as winter operations for some of the years mentioned in this thread:
1937 – OY made 10 crossings (5 roundtrips) over Cumbres, the OM made 6.
1938 – OY made 8 crossings over Cumbres, the OM made at least 4.
1941 – OY made 5 crossings over Cumbres, the OM made 3.
1942 – OY made none, the OM made 4.
I don’t know about other rotary activity on the narrow gauge for those years, except that during the winter of 1941, a rotary was used 8 times on the Chili Line (7 OY, 1 OM) and the ON made two roundtrips over Poncha Pass.