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Robert Jackson's Collection
 
7/28/2025
 
 
 
 
 
Owner: Union Pacific Railroad Company
Model:Alco 4-6-6-4Built As:UP 3985 (4-6-6-4)
Serial Number:70174Order No:S-1879
Frame Number:21X32 cylinders, 69" driversBuilt:6/1943
Notes:Challenger class 4664-4, donated to RRHMA.
Other locos with this serial:  UP 3985(4-6-6-4) CRR 676(4-6-6-4)
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3985 "Challenger"
Title:  3985 "Challenger"
Description:  The special Union Pacific steam train is seen departing West Chicago, Illinois, June 18, 2002 heading west. It is headed to Saint Paul, Minnesota to be displayed later. At this time the 4-6-6-4 “Challenger” steam locomotive, #3985, is the largest operating in the world. There are two sets of driving wheels and the frame is “articulated.” This way the wheels turn separately of the main frame to operate better where the track has tight turns. This engine was built in 1943. UP retired it from regular service in 1957. It was restored to operation once again in 1981 for use on special trips by UP. They converted it to run with oil instead of coal in 1990. UP ordered 105 “Challenger” locomotives between 1936 and 1943. They are about 122 feet long and weigh more than 1 million pounds. 3985 is the only one in operation of the two remaining. That is me (RLJ II) on the left videotaping at age 18. (Canon 35mm S.L.R. camera, Kodak Gold 800 print film)
Photo Date:  6/18/2002  Upload Date: 5/8/2019 8:54:52 AM
Location:  West Chicago, IL
Author:  Robert Jackson (father)
Categories:  Steam,Action
Locomotives:  UP 3985(4-6-6-4)
Views:  821   Comments: 2
UP "Challenger" #3985 at West Chicago
Title:  UP "Challenger" #3985 at West Chicago
Description:  The special Union Pacific steam train is seen departing West Chicago, Illinois, June 18, 2002 heading west. It is headed to Saint Paul, Minnesota to be displayed later. At this time the 4-6-6-4 “Challenger” steam locomotive, #3985, is the largest operating in the world. There are two sets of driving wheels and the frame is “articulated.” This way the wheels turn separately of the main frame to operate better where the track has tight turns. This engine was built in 1943. UP retired it from regular service in 1957. It was restored to operation once again in 1981 for use on special trips by UP. They converted it to run with oil instead of coal in 1990. UP ordered 105 “Challenger” locomotives between 1936 and 1943. They are about 122 feet long and weigh more than 1 million pounds. 3985 is the only one in operation of the two remaining. (Canon 35mm S.L.R. camera, Kodak Gold 800 print film)
Photo Date:  6/18/2002  Upload Date: 5/8/2019 9:48:04 AM
Location:  West Chicago, IL
Author:  Robert Jackson (father)
Categories:  Station,Action
Locomotives:  UP 3985(4-6-6-4)
Views:  1044   Comments: 2
UP "Challenger" #3985 steam engine!!!!
Title:  UP "Challenger" #3985 steam engine!!!!
Description:  The special Union Pacific steam train is seen departing West Chicago, Illinois, June 18, 2002 heading west. It is headed to Saint Paul, Minnesota to be displayed later. At this time the 4-6-6-4 “Challenger” steam locomotive, #3985, is the largest operating in the world. There are two sets of driving wheels and the frame is “articulated.” This way the wheels turn separately of the main frame to operate better where the track has tight turns. This engine was built in 1943. UP retired it from regular service in 1957. It was restored to operation once again in 1981 for use on special trips by UP. They converted it to run with oil instead of coal in 1990. UP ordered 105 “Challenger” locomotives between 1936 and 1943. They are about 122 feet long and weigh more than 1 million pounds. 3985 is the only one in operation of the two remaining. That is me (RLJ II) on the left videotaping at age 18. (Canon 35mm S.L.R. camera, Kodak Gold 800 print film)
Photo Date:  6/18/2002  Upload Date: 5/8/2019 8:51:08 AM
Location:  West Chicago, IL
Author:  Robert Jackson (father)
Categories:  Steam,Action
Locomotives:  UP 3985(4-6-6-4)
Views:  726   Comments: 2
UP 3985 side part
Title:  UP 3985 side part
Description:  We had a great Railroading Heritage of Midwest America Silvis shoip dtour during the great "Walk Amongst the Giants" event! The first RRHMA public event after opening to the public! NRE still owns the building and uses part of it and leases some to RRHMA! In a couple years NRE will vacate! I was happy to catch some NRE diesels here! (Canon AE-1 35mm camera, Fuji 400 Superia print film)
Photo Date:  6/29/2024  Upload Date: 6/27/2025 9:02:13 AM
Location:  Silvis, IL
Author:  Robert Jackson
Categories: 
Locomotives:  UP 3985(4-6-6-4)
Views:  102   Comments: 0
UP 5511
Title:  UP 5511
Description:  We had a great Railroading Heritage of Midwest America Silvis shop tour during the great "Walk Amongst the Giants" event! UP donated steam locos #5511 and "Challenger" #3985! The first RRHMA public event after opening to the public! NRE still owns the building and uses part of it and leases some to RRHMA! In a couple years NRE will vacate! I was happy to catch some NRE diesels here! (Canon AE-1 Program 35mm camera, Fuji 400 Superia print film)
Photo Date:  6/29/2024  Upload Date: 6/27/2025 9:00:03 AM
Location:  Silvis, IL
Author:  Robert Jackson
Categories: 
Locomotives:  UP 5511(2-10-2) UP 3985(4-6-6-4)
Views:  78   Comments: 0
UP Challenger 3985 rear disassembled
Title:  UP Challenger 3985 rear disassembled
Description:  We had a great Railroading Heritage of Midwest America Silvis shop tour during the great "Walk Amongst the Giants" event! UP donated steam locos #5511 and "Challenger" #3985! The first RRHMA public event after opening to the public! NRE still owns the building and uses part of it and leases some to RRHMA! In a couple years NRE will vacate! I was happy to catch some NRE diesels here! (Canon AE-1 Program 35mm camera, Fuji 400 Superia print film)
Photo Date:  6/29/2024  Upload Date: 6/28/2025 11:22:42 PM
Location:  Silvis, IL
Author:  Robert Jackson
Categories: 
Locomotives:  UP 3985(4-6-6-4)
Views:  77   Comments: 0
UP 3985 and UP 5511 steam locos being rebuilt
Title:  UP 3985 and UP 5511 steam locos being rebuilt
Description:  We had a great Railroading Heritage of Midwest America Silvis shop tour during the great "Walk Amongst the Giants" event! UP donated steam locos #5511 and "Challenger" #3985! Supposedly steam loco 3985 had UP "Big Boy's" tender. RRHMA is preparing on getting the right UP 3985 tender from UP 4014! "Swap Job!" The first RRHMA public event after opening to the public! NRE still owns the building and uses part of it and leases some to RRHMA! In a couple years NRE will vacate! I was happy to catch some NRE diesels here! (Canon AE-1 Program 35mm camera, Fuji 400 Superia print film)
Photo Date:  6/29/2024  Upload Date: 6/27/2025 8:59:19 AM
Location:  Silvis, IL
Author:  Robert Jackson
Categories: 
Locomotives:  UP 3985(4-6-6-4) UP 5511(2-10-2)
Views:  82   Comments: 0
UP 3985 and UP 5511 steam locos being rebuilt
Title:  UP 3985 and UP 5511 steam locos being rebuilt
Description:  We had a great Railroading Heritage of Midwest America Silvis shop tour during the great "Walk Amongst the Giants" event! UP donated steam locos #5511 and "Challenger" #3985! The first RRHMA public event after opening to the public! NRE still owns the building and uses part of it and leases some to RRHMA! In a couple years NRE will vacate! I was happy to catch some NRE diesels here! (Canon AE-1 Program 35mm camera, Fuji 400 Superia print film)
Photo Date:  6/29/2024  Upload Date: 6/27/2025 8:59:01 AM
Location:  Silvis, IL
Author:  Robert Jackson
Categories: 
Locomotives:  UP 5511(2-10-2) UP 3985(4-6-6-4)
Views:  96   Comments: 0
UP 3985 and UP 5511 steam locos being rebuilt.
Title:  UP 3985 and UP 5511 steam locos being rebuilt.
Description:  We had a great Railroading Heritage of Midwest America Silvis shop tour during the great "Walk Amongst the Giants" event! UP donated steam locos #5511 and "Challenger" #3985! The first RRHMA public event after opening to the public! NRE still owns the building and uses part of it and leases some to RRHMA! In a couple years NRE will vacate! I was happy to catch some NRE diesels here! (Canon AE-1 Program 35mm camera, Fuji 400 Superia print film)
Photo Date:  6/29/2024  Upload Date: 6/27/2025 8:59:47 AM
Location:  Silvis, IL
Author:  Robert Jackson
Categories: 
Locomotives:  UP 3985(4-6-6-4) UP 5511(2-10-2)
Views:  96   Comments: 0
UP 3985
Title:  UP 3985
Description:  We had a great Railroading Heritage of Midwest America Silvis shop tour during the great "Walk Amongst the Giants" event! UP donated steam locos #5511 and "Challenger" #3985! The first RRHMA public event after opening to the public! NRE still owns the building and uses part of it and leases some to RRHMA! In a couple years NRE will vacate! I was happy to catch some NRE diesels here! (Canon AE-1 Program 35mm camera, Fuji 400 Superia print film)
Photo Date:  6/29/2024  Upload Date: 6/27/2025 7:02:55 PM
Location:  Silvis, IL
Author:  Robert Jackson
Categories: 
Locomotives:  UP 3985(4-6-6-4)
Views:  78   Comments: 0


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