Frame Lengths and Truck Centers of Diesel Locomotives

This page is part of David Coscia's SP Site

YEARS: 1966-1967

FRAME LENGTH

TRUCK CENTERS

NOTES

SD40

65' 8"

40'

.

SD45

65' 8"

40'

.

SDP40

65' 8"

40'

.

SDP45

70' 8"

45' 2"

(1)



YEARS: 1968-1971

FRAME LENGTH

TRUCK CENTERS

NOTES

SD38

65' 9.5"

40'

.

SD39

65' 9.5"

40'

.

SD40

65' 9.5"

40'

(2)

SD40A

70' 8"

45' 2"

(3)

SD45

65' 9.5"

40'

(2)

SD45X

70' 8"

45' 2"

(1)



YEARS: 1972-1980+

FRAME LENGTH

TRUCK CENTERS

NOTES

SD38-2

68' 10"

43' 6"

.

SD40-2

68' 10"

43' 6"

.

SD45-2

68' 10"

43' 6"

.

SD40T-2

70' 8"

45' 2"

(1)

SD45T-2

70' 8"

45' 2"

(1)

SD50

71' 2"

45' 10"

.

SD60

71' 2"

45' 10"

.

SD70M

72' 4"

48' 8"

(4)



NOTES:
  1. SDP45, SD45X, SD40T-2 and SD45T-2 share the same length and truck centers
  2. Length changed in 1968 on SD40s and SD45s (+1.5 inches), although truck centers are the same.
  3. SD40A rides on SDP45 frame. Only 18 units built - all for Illinois Central Railroad.
  4. On SD70Ms, truck center distance is measured between carbody drive pins since radial trucks don't have a center pin