CN 6015 is a Class U1a Mountain (4-8-2) built in 1923 by Canadian Loco at Kingston Ontario. When retired it was put on display at the Canadian Railway Historical Association's museum at Delson Quebec in 1960.
Meanwhile, CN also placed on display at Jasper Alberta a Class U1f Mountain # 6060.It had been built in 1944 by Montreal Locomotive Works in Montreal, and was among the last new steam locomotives built for CN. The class (6060-6079) were known as "Bullet-Nose Betties" because of the conical smokebox front as seen here on 6077.The 6060 ownership was retained by CN.
In 1960, when the last steamers were retired from active service, CN kept some active for fantrip use. Among these were Northern 6167 (1960-1964) and Northern 6218 (1964-1971). It appeared that when 6218 was finally retired that would be it for mainline steam in Canada. Amazingly, CN decided to continue on. The Mountain 6060 was taken to Montreal to be rebuilt and was replaced by Mountain 6015, which can be seen on display there by the station today. Mountain 6060 re-entered service in 1973, and was used until 1980, when it was sold to the province of Alberta. Today, owned by the Rocky Mountain Rail Society, it operates out of Stettler Alberta on the Alberta Prairie Railway.
As well as 6060, two other Bullet-Nose Betties survive; 6069 at Sarnia Ontario,and 6076 at Capreol Ontario. Besides 6015, 6039 is at Steamtown, and 6043 is at Winnipeg Manitoba. None are operating.
If you ever get over to the Railway Preservation News website, there is a lot of info there about the current restoration taking place with 6069 that you might find interesting.