The GP40 is a 4-axle diesel-electric locomotive built by General Motors' Electro-Motive Division between November 1965 and December 1971. It has an EMD 645E3 16-cylinder engine generating 3,000 hp (2,240 kW).
The GP40 is 3 feet (0.914 m) longer than its EMD 567D3A-engined predecessor, the GP35, and distinguished visually by its three 48-inch radiator fans at the rear of the long hood, while the GP35 has two large fans and a smaller one in between. It was built on a 55 ft (16.76 m) frame; the GP35 was built on a 52 ft (15.85 m) frame - as was the GP7, 9, 18, and 30. The difference in length can be seen in the GP40's ten handrail stanchions compared to the GP35's nine.
1,187 GP40s were built for 28 U.S. railroads.On January 1, 1972, the GP40 was discontinued and replaced by the GP40-2, which has a modular electrical system and a few minor exterior changes.
| Horsepower | Wheel Arrangement | Gearing | Weight | Tractive Effort | DRGW Class | Builder |
| 3000 | B-B | 62:15 | 276545 (3051-62) 278050 (3063) 275856 (3064-68) 276352 (3069-80) 277180 (3081-85) 276617 (3086-93) ? (3131-53) |
65195 65571 64980 65072 65234 65093 ? |
DE B-B 65 | EMD |
| Road # | EMD Builder # | Purchased | Retired | Notes |
| 3051 | 30995 | 1/1966 | . | Demoted to B-unit, 1972 |
| 3052 | 30996 | 1/1966 | . | Demoted to B-unit, 1972 |
| 3053 | 30997 | 1/1966 | . | Demoted to B-unit, 1972 |
| 3054 | 30998 | 1/1966 | . | Demoted to B-unit, 1972 |
| 3055 | 30999 | 1/1966 | . | Demoted to B-unit, 1972 |
| 3056 | 31000 | 1/1966 | . | Demoted to B-unit, 1972 |
| 3057 | 31001 | 1/1966 | . | Demoted to B-unit, 1972 |
| 3058 | 31002 | 1/1966 | . | Demoted to B-unit, 1972 Destroyed in wreck, Byers Canyon, CO, 8/7/1982 |
| 3059 | 31003 | 1/1966 | . | Demoted to B-unit, 1972 |
| 3060 | 31004 | 1/1966 | . | Demoted to B-unit, 1972 |
| 3061 | 31005 | 1/1966 | . | Demoted to B-unit, 1972 |
| 3062 | 31006 | 1/1966 | . | Demoted to B-unit, 1972 |
| 3063 | 31440 | 1/1966 | 12/3/1974 | Demoted to B-unit, 1972 Destroyed in wreck, Hideaway Park, CO, 6/5/1974 Trade in on GP40-2 #3128 |
| 3064 | 32170 | 9/1966 | . | Demoted to B-unit, 1972 |
| 3065 | 32171 | 9/1966 | . | Demoted to B-unit, 1972 |
| 3066 | 32172 | 9/1966 | . | Demoted to B-unit, 1972 |
| 3067 | 32173 | 9/1966 | . | Demoted to B-unit, 1972 |
| 3068 | 32174 | 9/1966 | . | Demoted to B-unit, 1972 |
| 3069 | 32880 | 2/1967 | . | Demoted to B-unit, 1972 |
| 3070 | 32881 | 2/1967 | . | Demoted to B-unit, 1972 |
| 3071 | 32882 | 2/1967 | . | Demoted to B-unit, 1972 |
| 3072 | 32883 | 2/1967 | . | Demoted to B-unit, 1972 |
| 3073 | 32884 | 2/1967 | . | Demoted to B-unit, 1972 |
| 3074 | 32885 | 2/1967 | . | Demoted to B-unit, 1972 |
| 3075 | 32886 | 2/1967 | . | Demoted to B-unit, 1972 Rebuilt as GP40-2 as result of electrical fire, 8/17/1982 |
| 3076 | 32887 | 2/1967 | . | . |
| 3077 | 32888 | 2/1967 | . | . |
| 3078 | 32889 | 2/1967 | . | . |
| 3079 | 32890 | 2/1967 | . | . |
| 3080 | 32891 | 2/1967 | . | . |
| 3081 | 35577 | 10/1969 | . | Delivered with large Rio Grande lettering [LIST] Wrecked 9/1/1972, rebuilt as GP40-2 |
| 3082 | 35578 | 10/1969 | . | Delivered with large Rio Grande lettering [LIST] |
| 3083 | 35579 | 10/1969 | . | Delivered with large Rio Grande lettering [LIST] |
| 3084 | 35580 | 10/1969 | . | Delivered with large Rio Grande lettering [LIST] Another image of 3084 |
| 3085 | 35581 | 10/1969 | . | Delivered with large Rio Grande lettering [LIST] |
| 3086 | 38571 | 11/1971 | . | Delivered with large Rio Grande lettering [LIST] |
| 3087 | 38572 | 11/1971 | . | Delivered with large Rio Grande lettering [LIST] |
| 3088 | 38573 | 11/1971 | . | Delivered with large Rio Grande lettering [LIST] |
| 3089 | 38574 | 11/1971 | . | Delivered with large Rio Grande lettering [LIST] |
| 3090 | 38575 | 11/1971 | . | Delivered with large Rio Grande lettering [LIST] |
| 3091 | 38576 | 11/1971 | . | Delivered with large Rio Grande lettering [LIST] |
| 3092 | 38577 | 11/1971 | . | Delivered with large Rio Grande lettering [LIST] |
| 3093 | 38578 | 11/1971 | . | Delivered with large Rio Grande lettering [LIST] |
| GP40's #3131 through 3153 are ex-Conrail locomotives acquired by the Denver & Rio Grande Western in 1983. These units were re-painted at Mid-America Car in Kansas City between February, 1984 and April, 1985. (See the notes below for dates each unit was released from MAC.) All of these units received the large Rio Grande lettering. The orange on these units is markedly darker than that found on other locos in the Rio Grande fleet. This color is frequently referred to as "Kansas City" orange. It should be noted that many of the ex-Conrail units appeared on Rio Grande rails prior to being repainted. During that period of time, the ex-Conrail units were christened by some railfans with the nickname "Smurfs." [LIST] Also note that the in service date appears in the "Purchased" column rather than the date of 1/22/1984 when the purchase option was exercised. | ||||
| 3131 | 34290 | 11/3/1983 | . | Temporarily numbered 3173, was Conrail # 3113, built 8/1968, out of MAC 4/5/1984 [167] |
| 3132 | 34292 | 11/10/1983 | . | Temporarily numbered 3176, was Conrail #3115, built 8/1968, out of MAC 5/24/1984 [167] |
| 3133 | 34294 | 11/3/1983 | . | Temporarily numbered 3172, was Conrail #3117, built 8/1968, out of MAC 2/24/1984 [167] |
| 3134 | 34295 | 11/2/1983 | . | Temporarily numbered 3171, was Conrail #3118, built 8/1968, out of MAC 7/12/1984 [167] |
| 3135 | 34296 | 11/10/1983 | . | Temporarily numbered 3178, was Conrail #3119, built 8/1968, out of MAC 1/17/1985 [167] |
| 3136 | 34301 | 11/21/1983 | . | Temporarily numbered 3180, was Conrail #3124, built 8/1968, out of MAC 2/8/1985 [167] |
| 3137 | 34302 | 11/9/1983 | . | Temporarily numbered 3177, was Conrail #3125, built 8/1968, out of MAC 8/31/1984 [167] |
| 3138 | 34303 | 11/8/1983 | . | Temporarily numbered 3174, was Conrail #3126, built 8/1968, out of MAC 6/11/1984 [167] |
| 3139 | 34304 | 11/2/1983 | . | Temporarily numbered 3170, was Conrail #3127, built 8/1968, out of MAC 12/13/1984 [167] |
| 3140 | 34305 | 11/8/1983 | . | Temporarily numbered 3175, was Conrail #3128, built 9/1968, out of MAC 6/25/1984 [167] |
| 3141 | 34306 | 11/19/1983 | . | Temporarily numbered 3179, was Conrail #3129, built 9/1968, out of MAC 8/24/1984 [167] |
| 3142 | 34330 | 11/1/1983 | . | Temporarily numbered 3153, was Conrail #3153, built 9/1968, out of MAC 3/16/1984 [167] |
| 3143 | 34332 | 10/25/1983 | . | Temporarily numbered 3155, was Conrail #3155, built 9/1968, out of MAC 12/3/1984 [167] |
| 3144 | 34333 | 11/21/1983 | . | Temporarily numbered 3156, was Conrail #3156, built 9/1968, out of MAC 4/18/1984 [167] |
| 3145 | 34334 | 11/1/1983 | . | Temporarily numbered 3157, was Conrail #3157, built 9/1968, out of MAC 6/20/1984 [167] |
| 3146 | 34335 | 11/3/1983 | . | Temporarily numbered 3158, was Conrail #3158, built 9/1968, out of MAC 7/30/1984 [167] |
| 3147 | 34336 | 11/9/1983 | . | Temporarily numbered 3159, was Conrail #3159, built 9/1968, out of MAC 6/1/1984 [167] |
| 3148 | 34337 | 11/2/1983 | . | Temporarily numbered 3160, was Conrail #3160, built 10/1968, out of MAC 5/3/1984 [167] |
| 3149 | 34340 | 11/2/1983 | . | Temporarily numbered 3163, was Conrail #3163, built 10/1968, out of MAC 4/30/1985 [167] |
| 3150 | 34341 | 11/23/1983 | . | Temporarily numbered 3164, was Conrail #3164, built 10/1968, out of MAC 5/11/1984 [167] |
| 3151 | 34343 | 11/8/1983 | . | Temporarily numbered 3166, was Conrail #3166, built 10/1968, out of MAC 3/18/1985 [167] |
| 3152 | 34345 | 11/14/1983 | . | Temporarily numbered 3168, was Conrail #3168, built 10/1968, out of MAC 2/25/1985 [167] |
| 3153 | 34346 | 12/3/1983 | . | Temporarily numbered 3169, was Conrail #3169, built 10/1968, out of MAC 1/4/1985 |
