31) Caption reads:  A scene from the autumn of 1948 finds a Lehigh Valley RR Consolidation (2-8-0) [in background] soaring over the Delaware River near Easton PA while Pacific (4-6-2) #2102 [in foreground] steams in the yard waiting for its next assignment.  (Photo by John M Marris Sr)

32) Caption reads:  Locomotive #3254 was built by Canadian Locomotive Company Ltd in 1917 for the Canadian Government Railways and was transferred to the Canadian National in 1923. #3254, a Mikado-type locomotive (2-8-2), is now used in excursion service at Steamtown in Scranton PA.  (Photo courtesy: Eugene Trencansky)

33) Caption reads:  Built by the American Locomotive Co in 1943, #3985 is a Challenger Class locomotive (4-6-6-4) and although designed for fast freight service, Challengers were occasionally used in passenger service. #3985 is now used in excursion service and on special Union Pacific trains.  (Photo courtesy: Ken Church)

34) Caption reads:  One of the big ones, Union Pacific 'Big Boy' #4003 is ready to depart with freight from Cheyenne WY in Nov 1956.  (Photo by Douglas Wornom)

35) Caption reads:  Built in Nov 1941 in Schenectady NY by the American Locomotive Co. Retired in 1962 after 1-million-plus miles of service. 133 feet long. 1.2 million pounds. 6000 horsepower. Burned 12 ton of coal per hour. Capable of speeds of up to 80 mph. Cost new: $265,174. Now on display at Steamtown USA, Bellows Falls VT. Donated to the Steamtown Foundation by the Union Pacific RR.  (Photo by Richard Towle)

36) Caption reads:  Union Pacific's "Big Boy" #4016 (4-8-8-4) was called to assist a turbine-powered train out of Cheyenne on Oct 31, 1958. Within a week, regularly assigned steam locomotives on the UP would be but a memory.  (Photo courtesy: Walter R Evans)

37) Caption reads:  Big Boy #4004 and a mixed train pause along the west main track to take on water at Red Butte WY in 1958.  (From "Big Boys 1990 Calendar - Spectacular Vintage Photographs Of The Union Pacific 4-8-8-4", by Video Rails; photo by R H Kindig)

38) Union Pacific RR 'Big Boy' #4012.  (From "Big Boys 1990 Calendar - Spectacular Vintage Photographs Of The Union Pacific 4-8-8-4", by Video Rails)

39) Caption reads:  Big Boy #4015 pokes out from under the coaling tower at Denver CO as Challenger-type #3954 stands by on a cold day in the winter of 1954.  (From "Big Boys 1990 Calendar - Spectacular Vintage Photographs Of The Union Pacific 4-8-8-4", by Video Rails; photo by R H Kindig)

40) Caption reads:  Hard-working #4004 smokes up the sky near Speer WY in 1958, heading a manifest of empty fruit reefers back to western producers.  (From "Big Boys 1990 Calendar - Spectacular Vintage Photographs Of The Union Pacific 4-8-8-4", by Video Rails; photo by Stan Kistler)