According to the book, 'Steam locomotives Of The Burlington Route', by Bernard G. Corbin and William F. Kerka, number 5622 was completed at West Burlington in August 1938, so this photo was likely shot around that date. The boilers were built by Baldwin, and the builder's plate on the smokebox would show Baldwin Extra Order 6675. There were five boilers built on Extra Order 6675, which were applied to locomotives 5621 through 5625. The rest of the locomotive was assembled from components from various suppliers. Number 5622 was retired in May 1960.

Hol Wagner adds: That is indeed the west end of the West Burlington storehouse, with the main erecting shop's east end just out of view behind the photographer to the right. And of course this means the view is of the north side of the locomotive, thus the sun is on the other side. Fred Lehmann must not have been able to get them to move the 5622 down the length of the erecting shop and into the clear for a south side photo.

You guessed well; it is indeed at Fort Collins on June 10, 1959, on the 'private' trip Howard Fogg ran from Denver to Fort Collins and return for invited guests. The man in the white cap up on the tender is C&S road foreman of engines R.E. 'Mickey' Hansen, who generally ran the engine on every fantrip over the C&S. He can be seen in the cab of the photo I posted a couple of weeks ago taken on this same trip at Church's Lake and showing the engine's Chinese red cab roof.

http://www.steamlocomotive.com/places/jensen/