ORR&N 2-8-8-2 — 3 locomotives (compound)
| 1915 OWRR&N Number |
First Number |
Second Number |
Builder | Builder Number |
Date Built |
Date Vacated |
Notes |
| OWRR&N 3800 | ORR&N 450 | OWRR&N 700 | Baldwin | 34016 | Nov 1909 | Sep 1928 | 1 |
| OWRR&N 3801 | ORR&N 451 | OWRR&N 701 | Baldwin | 34017 | Nov 1909 | Oct 1928 | 2 |
| OWRR&N 3802 | ORR&N 452 | OWRR&N 702 | Baldwin | 34018 | Nov 1909 | Nov 1928 | 3 |
Description:
| CS Class: MC-1 |
| Drive Wheel Diameter: 57 inches |
| Cylinders: 26&40x30 |
| Maximum Tractive Effort: 94,880 pounds |
| Weight on Drivers: 394,150 pounds |
| Weight in Working Order (Engine Only): 425,900 pounds |
| Weight in Working Order (Engine and Tender): 599,181 pounds |
| Fuel: Oil |
General Notes:
| a. | Mallet Compound (MC) |
| b. | Built as ORR&N 450-452 in 1909; renumbered to OWRR&N 700-702 in 1911; renumbered to OWRR&N 3800-3802 in 1915-1916. |
| c. | OWRR&N 3800 was equipped with a stoker in December 1917. |
| d. | OWRR&N 3802 was equipped with a stoker in March 1918. |
| e. | OWRR&N 3800-3802 were assigned to LaGrande, Oregon for service in the Blue Mountains. |
| f. | See "Ocean Toads, 1909 Monster Mallets", by James L Ehernberger, The Streamliner, Volume 5, Number 2, pages 13-24 |
Notes:
OWRR&N 2-8-8-0 — 3 locomotives (compound)
| OWRR&N Number |
Builder | Builder Number |
Date Built |
Date Converted To Simple |
OWRR&N Number As Simple |
| OWRR&N 3803 (1st) | Brooks | 63776 | Mar 1923 | Apr 1944 | OWRR&N 3567 |
| OWRR&N 3804 (1st) | Brooks | 63777 | Mar 1923 | Apr 1944 | OWRR&N 3568 |
| OWRR&N 3805 (1st) | Brooks | 63778 | Mar 1923 | Apr 1944 | OWRR&N 3569 |
Description:
| CS Class: MC-4 |
| Cabside Class: MC-57 |
| Drive Wheel Diameter: 57 inches (rebuilt to 59 inches in 1944) |
| Cylinders: 26&41x32 inches (rebuilt to 23&23x30 inches in 1944) |
| Maximum Tractive Effort: 103,000 pounds |
| Weight on Drivers: 464,000 pounds |
| Weight in Working Order (Engine Only): 494,500 pounds |
| Weight in Working Order (Engine and Tender): 712,600 pounds |
| Fuel: Oil (converted from coal) |
General Notes:
UP 4-6-6-4 — 15 locomotives "Light Challengers"
| 1944 UP Number |
First Number |
Date To 3800 Series |
Builder | Builder Number |
Date Built |
1949-1950 UP Number |
Date Vacated |
| UP 3800 (2nd) | UP 3900 | Apr 1944 | Schenectady | 68745 | Sep 1936 | Aug 1957 | |
| UP 3801 (2nd) | UP 3901 | Apr 1944 | Schenectady | 68746 | Sep 1936 | UP 3701 | Sep 1957 |
| UP 3802 (2nd) | UP 3902 | Apr 1944 | Schenectady | 68747 | Sep 1936 | UP 3702 | Dec 1958 |
| UP 3803 (2nd) | UP 3903 | Apr 1944 | Schenectady | 68748 | Sep 1936 | May 1959 | |
| UP 3804 (2nd) | UP 3904 | Apr 1944 | Schenectady | 68749 | Sep 1936 | UP 3704 | Jul 1959 |
| UP 3805 (2nd) | UP 3905 | Apr 1944 | Schenectady | 68750 | Sep 1936 | Feb 1956 | |
| UP 3806 | UP 3906 | Apr 1944 | Schenectady | 68751 | Sep 1936 | Jul 1962 | |
| UP 3807 | UP 3907 | Apr 1944 | Schenectady | 68752 | Sep 1936 | UP 3707 | Aug 1957 |
| UP 3808 | UP 3908 | Apr 1944 | Schenectady | 68753 | Sep 1936 | Apr 1957 | |
| UP 3809 | UP 3909 | Apr 1944 | Schenectady | 68754 | Sep 1936 | UP 3709 | Aug 1957 |
| UP 3810 | UP 3910 | Apr 1944 | Schenectady | 68755 | Sep 1936 | UP 3710 | Sep 1956 |
| UP 3811 | UP 3911 | Apr 1944 | Schenectady | 68756 | Sep 1936 | UP 3711 | Sep 1956 |
| UP 3812 | UP 3912 | Apr 1944 | Schenectady | 68757 | Sep 1936 | Dec 1958 | |
| UP 3813 | UP 3913 | Apr 1944 | Schenectady | 68758 | Sep 1936 | Sep 1956 | |
| UP 3814 | UP 3914 | Apr 1944 | Schenectady | 68759 | Sep 1936 | UP 3714 | Jun 1957 |
Description:
| CS Class: CSA-1 |
| Cabside Class: CSA-69 |
| Drive Wheel Diameter: 69 inches |
| Cylinders: 22&22x32 inches |
| Maximum Tractive Effort: 97,400 pounds |
| Weight on Drivers: 386,000 pounds (as built) (in later years their weight-on-drivers varied between 399,660 pounds and 407,610 pounds depending on type of feedwater heater and weight of front engine) |
| Weight in Working Order (Engine Only): 566,000 pounds (as built) (in later years their weight varied between 569,820 pounds and 590,550 pounds depending on type of feedwater heater and weight of front engine) |
| Weight in Working Order (Engine and Tender): 876,000 pounds (as built) (varied between 892,420 pounds and 915,000 pounds depending on type of feedwater heater and weight of front engine)) |
| Fuel: Oil (eight locomotives converted to coal, then back to oil) |
General Notes:
| a. | Challenger Simple Articulated (CSA) |
| b. | UP 3800-3814 were built as UP 3900-3914 in 1936; to UP 3800-3814 in 1944 to clear the 3900 series for use by new 4664-5 class Challengers |
| c. | Eight locomotives (UP 3801, 3802, 3804, 3807, 3809, 3810, 3811, 3814) were converted to coal burners in 1949 and renumbered to UP 3701-3714; all eight locomotives were converted back to oil burners in 1950 and renumbered back to their 3800 series numbers |
| d. | (click here to read a brief narrative written by Allen Copeland in 1978) |
UP 4-6-6-4 — 25 locomotives "Light Challengers"
| 1944 UP Number |
First Number |
Date To 3800 Series |
Builder | Builder Number |
Date Built |
1949-1950 UP Number |
Date Vacated |
| UP 3815 | UP 3915 | Apr 1944 | Schenectady | 68924 | Aug 1937 | Dec 1958 | |
| UP 3816 | UP 3916 | Apr 1944 | Schenectady | 68925 | Aug 1937 | Apr 1957 | |
| UP 3817 | UP 3917 | Apr 1944 | Schenectady | 68926 | Aug 1937 | UP 3717 | Jun 1957 |
| UP 3818 | UP 3918 | Apr 1944 | Schenectady | 68927 | Aug 1937 | UP 3718 | Mar 1961 |
| UP 3819 | UP 3919 | Apr 1944 | Schenectady | 68928 | Aug 1937 | Jul 1957 | |
| UP 3820 | UP 3920 | Apr 1944 | Schenectady | 68929 | Aug 1937 | Aug 1957 | |
| UP 3821 | UP 3921 | Apr 1944 | Schenectady | 68930 | Aug 1937 | Apr 1957 | |
| UP 3822 | UP 3922 | Apr 1944 | Schenectady | 68931 | Aug 1937 | Sep 1957 | |
| UP 3823 | UP 3923 | Apr 1944 | Schenectady | 68932 | Aug 1937 | Jul 1959 | |
| UP 3824 | UP 3924 | Apr 1944 | Schenectady | 68933 | Aug 1937 | Jul 1957 | |
| UP 3825 | UP 3925 | Apr 1944 | Schenectady | 68934 | Aug 1937 | Apr 1957 | |
| UP 3826 | UP 3926 | Apr 1944 | Schenectady | 68935 | Aug 1937 | Nov 1956 | |
| UP 3827 | UP 3927 | Apr 1944 | Schenectady | 68936 | Aug 1937 | Dec 1958 | |
| UP 3828 | UP 3928 | Apr 1944 | Schenectady | 68937 | Aug 1937 | Jul 1959 | |
| UP 3829 | UP 3929 | Apr 1944 | Schenectady | 68938 | Aug 1937 | Jul 1957 | |
| UP 3830 | UP 3930 (1st) | Apr 1944 | Schenectady | 68939 | Aug 1937 | May 1959 | |
| UP 3831 | UP 3931 (1st) | Apr 1944 | Schenectady | 68940 | Aug 1937 | Jun 1957 | |
| UP 3832 | UP 3932 (1st) | Apr 1944 | Schenectady | 68941 | Aug 1937 | May 1959 | |
| UP 3833 | UP 3933 (1st) | Apr 1944 | Schenectady | 68942 | Aug 1937 | Nov 1956 | |
| UP 3834 | UP 3934 (1st) | Apr 1944 | Schenectady | 68943 | Aug 1937 | Nov 1954 | |
| UP 3835 | UP 3935 (1st) | Apr 1944 | Schenectady | 68944 | Aug 1937 | Nov 1956 | |
| UP 3836 | UP 3936 (1st) | Apr 1944 | Schenectady | 68945 | Aug 1937 | Nov 1956 | |
| UP 3837 | UP 3937 (1st) | Apr 1944 | Schenectady | 68946 | Aug 1937 | Jul 1957 | |
| UP 3838 | UP 3938 (1st) | Apr 1944 | Schenectady | 68947 | Aug 1937 | May 1959 | |
| UP 3839 | UP 3939 (1st) | Apr 1944 | Schenectady | 68948 | Aug 1937 | Aug 1957 |
Description:
| CS Class: CSA-2 |
| Cabside Class: CSA-69 |
| Drive Wheel Diameter: 69 inches |
| Cylinders: 22&22x32 inches |
| Maximum Tractive Effort: 97,400 pounds |
| Weight on Drivers: 403,000 pounds (as built) (in later years their weight-on-drivers varied between 399,660 pounds and 407,610 pounds depending on type of feedwater heater and weight of front engine) |
| Weight in Working Order (Engine Only, UP 3915-3933): 582,000 pounds (as built) (in later years their weight varied between 569,820 pounds and 590,550 pounds depending on type of feedwater heater and weight of front engine) |
| Weight in Working Order (Engine Only, UP 3934-3939): 584,100 pounds (as built) (in later years their weight varied between 569,820 pounds and 590,550 pounds depending on type of feedwater heater and weight of front engine) |
| Weight in Working Order (Engine and Tender, UP 3815-3833): 894,000 pounds (as built) (varied between 892,420 pounds and 915,000 pounds depending on type of feedwater heater and weight of front engine) |
| Weight in Working Order (Engine and Tender, UP 3834-3839): 896,100 pounds (as built) (varied between 892,420 pounds and 915,000 pounds depending on type of feedwater heater and weight of front engine) |
| Fuel: Oil (two locomotives converted to coal then back to oil) |
General Notes:
| a. | Challenger Simple Articulated (CSA) |
| b. | UP 3815-3839 were built as UP 3915-3939 in 1937; to UP 3815-3839 in 1944 to clear the 3900 series for use by new 4664-5 class Challengers |
| c. | UP 3817 and 3818 were built as oil burners; converted to coal-burners in 1949 and renumbered to UP 3717 and 3718; converted back to oil burners in 1950 and renumbered back to UP 3817 and 3818. |
| d. | UP 3834-3839 (six locomotives) were built as coal burners; converted to oil burners upon delivery and assigned to passenger service on the LA&SL. |
| e. | (click here to read a brief narrative written by Allen Copeland in 1978) |
UP 4-6-6-4 — 15 locomotives "Light Challengers"
| Road Number |
Builder | Builder Number |
Date Built |
Date Renumbered |
1944 UP Number |
| UP 3900 | Schenectady | 68745 | Sep 1936 | Apr 1944 | UP 3800 |
| UP 3901 | Schenectady | 68746 | Sep 1936 | Apr 1944 | UP 3801 |
| UP 3902 | Schenectady | 68747 | Sep 1936 | Apr 1944 | UP 3802 |
| UP 3903 | Schenectady | 68748 | Sep 1936 | Apr 1944 | UP 3803 |
| UP 3904 | Schenectady | 68749 | Sep 1936 | Apr 1944 | UP 3804 |
| UP 3905 | Schenectady | 68750 | Sep 1936 | Apr 1944 | UP 3805 |
| UP 3906 | Schenectady | 68751 | Sep 1936 | Apr 1944 | UP 3806 |
| UP 3907 | Schenectady | 68752 | Sep 1936 | Apr 1944 | UP 3807 |
| UP 3908 | Schenectady | 68753 | Sep 1936 | Apr 1944 | UP 3808 |
| UP 3909 | Schenectady | 68754 | Sep 1936 | Apr 1944 | UP 3809 |
| UP 3910 | Schenectady | 68755 | Sep 1936 | Apr 1944 | UP 3810 |
| UP 3911 | Schenectady | 68756 | Sep 1936 | Apr 1944 | UP 3811 |
| UP 3912 | Schenectady | 68757 | Sep 1936 | Apr 1944 | UP 3812 |
| UP 3913 | Schenectady | 68758 | Sep 1936 | Apr 1944 | UP 3813 |
| UP 3914 | Schenectady | 68759 | Sep 1936 | Apr 1944 | UP 3814 |
Description:
| CS Class: CSA-1 |
| Cabside Class: CSA-69 |
| Drive Wheel Diameter: 69 inches |
| Cylinders: 22&22x32 inches |
| Maximum Tractive Effort: 97,400 pounds |
| Weight on Drivers: 386,000 pounds (as built) (in later years their weight-on-drivers varied between 399,660 pounds and 407,610 pounds depending on type of feedwater heater and weight of front engine) |
| Weight in Working Order (Engine Only): 566,000 pounds (as built) (in later years their weight varied between 569,820 pounds and 590,550 pounds depending on type of feedwater heater and weight of front engine) |
| Weight in Working Order (Engine and Tender): 876,000 pounds (as built) (varied between 892,420 pounds and 915,000 pounds depending on type of feedwater heater and weight of front engine)) |
| Fuel: Coal (converted to oil in 1941-1943) |
General Notes:
| a. | Challenger Simple Articulated (CSA) |
| b. | UP 3900-3914 were built in 1936 was coal burners; converted to oil burners starting in September 1941; completed in March 1943 |
| c. | Built as UP 3900-3914 in 1936; to UP 3800-3814 in 1944 to clear the 3900 series for use by new 4664-5 class Challengers |
| d. | (click here to read a brief narrative written by Allen Copeland in 1978) |
UP 4-6-6-4 — 25 locomotives "Light Challengers"
| Road Number |
Builder | Builder Number |
Date Built |
Date Renumbered |
1944 UP Number |
| UP 3915 | Schenectady | 68924 | Aug 1937 | Apr 1944 | UP 3815 |
| UP 3916 | Schenectady | 68925 | Aug 1937 | Apr 1944 | UP 3816 |
| UP 3917 | Schenectady | 68926 | Aug 1937 | Apr 1944 | UP 3817 |
| UP 3918 | Schenectady | 68927 | Aug 1937 | Apr 1944 | UP 3818 |
| UP 3919 | Schenectady | 68928 | Aug 1937 | Apr 1944 | UP 3819 |
| UP 3920 | Schenectady | 68929 | Aug 1937 | Apr 1944 | UP 3820 |
| UP 3921 | Schenectady | 68930 | Aug 1937 | Apr 1944 | UP 3821 |
| UP 3922 | Schenectady | 68931 | Aug 1937 | Apr 1944 | UP 3822 |
| UP 3923 | Schenectady | 68932 | Aug 1937 | Apr 1944 | UP 3823 |
| UP 3924 | Schenectady | 68933 | Aug 1937 | Apr 1944 | UP 3824 |
| UP 3925 | Schenectady | 68934 | Aug 1937 | Apr 1944 | UP 3825 |
| UP 3926 | Schenectady | 68935 | Aug 1937 | Apr 1944 | UP 3826 |
| UP 3927 | Schenectady | 68936 | Aug 1937 | Apr 1944 | UP 3827 |
| UP 3928 | Schenectady | 68937 | Aug 1937 | Apr 1944 | UP 3828 |
| UP 3929 | Schenectady | 68938 | Aug 1937 | Apr 1944 | UP 3839 |
| UP 3930 (1st) | Schenectady | 68939 | Aug 1937 | Apr 1944 | UP 3830 |
| UP 3931 (1st) | Schenectady | 68940 | Aug 1937 | Apr 1944 | UP 3831 |
| UP 3932 (1st) | Schenectady | 68941 | Aug 1937 | Apr 1944 | UP 3832 |
| UP 3933 (1st) | Schenectady | 68942 | Aug 1937 | Apr 1944 | UP 3833 |
| UP 3934 (1st) | Schenectady | 68943 | Aug 1937 | Apr 1944 | UP 3834 |
| UP 3935 (1st) | Schenectady | 68944 | Aug 1937 | Apr 1944 | UP 3835 |
| UP 3936 (1st) | Schenectady | 68945 | Aug 1937 | Apr 1944 | UP 3836 |
| UP 3937 (1st) | Schenectady | 68946 | Aug 1937 | Apr 1944 | UP 3837 |
| UP 3938 (1st) | Schenectady | 68947 | Aug 1937 | Apr 1944 | UP 3838 |
| UP 3939 (1st) | Schenectady | 68948 | Aug 1937 | Apr 1944 | UP 3839 |
Description:
| CS Class: CSA-2 |
| Cabside Class: CSA-69 |
| Drive Wheel Diameter: 69 inches |
| Cylinders: 22&22x32 inches |
| Maximum Tractive Effort: 97,400 pounds |
| Weight on Drivers: 403,000 pounds (as built) (in later years their weight-on-drivers varied between 399,660 pounds and 407,610 pounds depending on type of feedwater heater and weight of front engine) |
| Weight in Working Order (Engine Only, UP 3915-3933): 582,000 pounds (as built) (in later years their weight varied between 569,820 pounds and 590,550 pounds depending on type of feedwater heater and weight of front engine) |
| Weight in Working Order (Engine Only, UP 3934-3939): 584,100 pounds (as built) (in later years their weight varied between 569,820 pounds and 590,550 pounds depending on type of feedwater heater and weight of front engine) |
| Weight in Working Order (Engine and Tender, UP 3815-3833): 894,000 pounds (as built) (varied between 892,420 pounds and 915,000 pounds depending on type of feedwater heater and weight of front engine) |
| Weight in Working Order (Engine and Tender, UP 3834-3839): 896,100 pounds (as built) (varied between 892,420 pounds and 915,000 pounds depending on type of feedwater heater and weight of front engine) |
| Fuel: Coal (converted to oil) |
General Notes:
| a. | Challenger Simple Articulated (CSA) |
| b. | UP 3915-3933 were built in 1937 as coal burners; converted to oil burners starting in 1941-1943 |
| c. | UP 3834-3839 (six locomotives) were built as coal burners; converted to oil burners upon delivery and assigned to passenger service on the LA&SL. |
| d. | Built as UP 3915-3939 in 1937; renumbered to UP 3815-3839 in 1944 to clear the 3900 series for use by new 4664-5 class Challengers |
| e. | (click here to read a brief narrative written by Allen Copeland in 1978) |
UP 4-6-6-4 — 20 locomotives
| Road Number |
Builder | Builder Number |
Date Built |
Date Vacated |
1952 UP Number |
| UP 3930 (2nd) | Schenectady | 72792 | Aug 1944 | 1952 | UP 3700 (2nd) |
| UP 3931 (2nd) | Schenectady | 72793 | Aug 1944 | 1952 | UP 3701 (3rd) |
| UP 3932 (2nd) | Schenectady | 72794 | Aug 1944 | 1952 | UP 3702 (3rd) |
| UP 3933 (2nd) | Schenectady | 72795 | Aug 1944 | Jun 1959 | |
| UP 3934 (2nd) | Schenectady | 72796 | Aug 1944 | 1952 | UP 3703 (2nd) |
| UP 3935 (2nd) | Schenectady | 72797 | Aug 1944 | Jun 1959 | |
| UP 3936 (2nd) | Schenectady | 72798 | Aug 1944 | Jun 1959 | |
| UP 3937 (2nd) | Schenectady | 72799 | Aug 1944 | 1952 | UP 3704 (3rd) |
| UP 3938 (2nd) | Schenectady | 72800 | Aug 1944 | 1952 | UP 3705 (2nd) |
| UP 3939 (2nd) | Schenectady | 72801 | Aug 1944 | Jun 1959 | |
| UP 3940 | Schenectady | 72802 | Aug 1944 | Jul 1959 | |
| UP 3941 | Schenectady | 72803 | Aug 1944 | Sep 1959 | |
| UP 3942 | Schenectady | 72804 | Aug 1944 | Dec 1959 | |
| UP 3943 | Schenectady | 72805 | Aug 1944 | 1952 | UP 3706 |
| UP 3944 | Schenectady | 72806 | Aug 1944 | 1952 | UP 3707 (2nd) |
| UP 3945 | Schenectady | 72807 | Aug 1944 | Oct 1959 | |
| UP 3946 | Schenectady | 72808 | Aug 1944 | Jul 1960 | |
| UP 3947 | Schenectady | 72809 | Aug 1944 | Dec 1959 | |
| UP 3948 | Schenectady | 72810 | Aug 1944 | Dec 1959 | |
| UP 3949 | Schenectady | 72811 | Aug 1944 | Oct 1959 |
Description:
| Cabside Class: 4664-5 |
| Drive Wheel Diameter: 69 inches |
| Cylinders: 21&21x32 inches |
| Maximum Tractive Effort: 97,350 pounds |
| Weight on Drivers: 406,200 pounds |
| Weight in Working Order (Engine Only): 634,500 pounds |
| Weight in Working Order (Engine and Tender): 1,071,000 pounds |
| Fuel: Coal |
General Notes:
| a. | Eight UP 3900 series locomotives were converted from coal to oil in 1952 and renumbered to UP 3700-3707 |
UP 4-6-6-4 — 20 locomotives
| Road Number |
Builder | Builder Number |
Date Built |
Date Vacated |
| UP 3950 | Schenectady | 69760 | May 1942 | Mar 1961 |
| UP 3951 | Schenectady | 69761 | May 1942 | Dec 1959 |
| UP 3952 | Schenectady | 69762 | May 1942 | Jul 1960 |
| UP 3953 | Schenectady | 69763 | May 1942 | Feb 1960 |
| UP 3954 | Schenectady | 69764 | May 1942 | Feb 1960 |
| UP 3955 | Schenectady | 69765 | May 1942 | Dec 1958 |
| UP 3956 | Schenectady | 69766 | May 1942 | Feb 1960 |
| UP 3957 | Schenectady | 69767 | May 1942 | Feb 1960 |
| UP 3958 | Schenectady | 69768 | May 1942 | Mar 1960 |
| UP 3959 | Schenectady | 69769 | May 1942 | Jul 1960 |
| UP 3960 | Schenectady | 69770 | May 1942 | Dec 1958 |
| UP 3961 | Schenectady | 69771 | May 1942 | Dec 1958 |
| UP 3962 | Schenectady | 69772 | May 1942 | Mar 1960 |
| UP 3963 | Schenectady | 69773 | May 1942 | Oct 1959 |
| UP 3964 | Schenectady | 69774 | May 1942 | Oct 1959 |
| UP 3965 | Schenectady | 69775 | May 1942 | Jul 1960 |
| UP 3966 | Schenectady | 69776 | May 1942 | Mar 1960 |
| UP 3967 | Schenectady | 69777 | May 1942 | Mar 1960 |
| UP 3968 | Schenectady | 69778 | May 1942 | Apr 1960 |
| UP 3969 | Schenectady | 69779 | May 1942 | Apr 1960 |
Description:
UP 4-6-6-4 — 25 locomotives
| Road Number |
Builder | Builder Number |
Date Built |
Date Vacated |
1952 UP Number |
Notes |
| UP 3975 | Schenectady | 70158 | Jun 1943 | 1952 | UP 3708 | |
| UP 3976 | Schenectady | 70159 | Jun 1943 | 1952 | UP 3709 (2nd) | |
| UP 3977 | Schenectady | 70160 | Jun 1943 | 1952 | UP 3710 (2nd) | 1 |
| UP 3978 | Schenectady | 70161 | Jun 1943 | 1952 | UP 3711 (2nd) | |
| UP 3979 | Schenectady | 70162 | Jun 1943 | 1952 | UP 3712 | |
| UP 3980 | Schenectady | 70169 | Jun 1943 | 1952 | UP 3713 | |
| UP 3981 | Schenectady | 70170 | Jun 1943 | 1952 | UP 3714 (2nd) | |
| UP 3982 | Schenectady | 70171 | Jun 1943 | 1952 | UP 3715 | |
| UP 3983 | Schenectady | 70172 | Jun 1943 | 1952 | UP 3716 | |
| UP 3984 | Schenectady | 70173 | Jun 1943 | 1952 | UP 3717 (2nd) | |
| UP 3985 | Schenectady | 70174 | Jun 1943 | 2 | ||
| UP 3986 | Schenectady | 70175 | Jun 1943 | Apr 1960 | ||
| UP 3987 | Schenectady | 70176 | Jun 1943 | Apr 1960 | ||
| UP 3988 | Schenectady | 70177 | Jun 1943 | Oct 1960 | ||
| UP 3989 | Schenectady | 70178 | Jun 1943 | Aug 1960 | ||
| UP 3990 | Schenectady | 70179 | Jun 1943 | Aug 1960 | ||
| UP 3991 | Schenectady | 70180 | Jun 1943 | Mar 1961 | ||
| UP 3992 | Schenectady | 70181 | Jun 1943 | Aug 1960 | ||
| UP 3993 | Schenectady | 70182 | Jun 1943 | Aug 1960 | ||
| UP 3994 | Schenectady | 70678 | Jul 1943 | Jul 1959 | ||
| UP 3995 | Schenectady | 70679 | Jul 1943 | Oct 1960 | ||
| UP 3996 | Schenectady | 70680 | Jul 1943 | Oct 1960 | ||
| UP 3997 | Schenectady | 70681 | Jul 1943 | Oct 1960 | ||
| UP 3998 | Schenectady | 70682 | Jul 1943 | Dec 1960 | ||
| UP 3999 | Schenectady | 70683 | Jul 1943 | Dec 1960 |
Description:
| Cabside Class: 4664-4 |
| Drive Wheel Diameter: 69 inches |
| Cylinders: 21&21x32 inches |
| Maximum Tractive Effort: 97,350 pounds |
| Weight on Drivers: 407,500 pounds |
| Weight in Working Order (Engine Only): 633,500 pounds |
| Weight in Working Order (Engine and Tender): 1,070,000 pounds |
| Fuel: Coal (UP 3975-3984 converted to oil) |
General Notes:
| a. | UP 3975-3984 (10 locomotives) were converted from coal burners to oil burners in 1945 and assigned to service on the Northwestern District (OWRR&N); renumbered to UP 3700 series in 1952. |
Notes:
| 1. | UP 3977 renumbered to UP 3710 in 1952; retired by UP in 1961; stored in the roundhouse at North Platte, Nebraska until donated to City of North Platte in June 1968; renumbered back to UP 3977; displayed at Cody Park, North Platte, Nebraska. |
| 2. | UP 3985 was first retired in July 1962; stored at Cheyenne, Wyoming until placed on display at the Cheyenne depot in October 1974; removed from display in September 1979 and returned to service April 1981 (reinstated to roster in March 1981). (click here for more information about UP 3985 in service after 1981 as part of UP's Heritage Fleet) |
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