Canadian Pacific was the only line in North America to use the 4-4-4 wheel arrangement. They were generally used for light fast passenger and short trip service.
This is the streamlined short-wheelbase version and below, before installation of the shroud.
Twenty were built and they were in service till the end of the steam era. Two survive, one at the Canadian Railway Museum in Delson Quebec, the other at Steamtown in Scranton Pa.