Edwin P. Alexander, American Locomotives Bonanza Books 1950
This was another of the early Mallet experiments, basically two engines attached to a single boiler. Similar to the Canadian Pacific pushers, there were no leading and trailing trucks to reduce tractive effort, all weight was on the driving wheels. There were three of these first 0-8-8-0 Mallets on the Erie Railway, and they are particularly interesting as being the only "camelback" engines of such wheel arrangement ever built. They were primarily used in pushing service and especially on the heavy grades of the Delaware and Susquehanna Divisions. When rebuilt in 1921 with a pair of leading and trailing wheels, the cab was moved back over the firebox. The original designation was "Angus" type.