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1924 Reclassification
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Classification
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D&RGW Classification of Locomotives
 Railroads typically use some type of
classification system to designate the size of a locomotive. Originally, the Denver and
Rio Grande classed their locomotives by the weight of the locomotive. In addition to the
class designation, each locomotive is given its own road number.
In 1924 the entire system was reorganized and the newly merged Rio Grande Western
equipment was added.
Class and road numbers prior to 1924
| Class |
Wheel |
Weight |
Tractive
Effort |
Road Numbers (7) |
| 25 |
2-4-0 |
25,000 |
3600 |
1, 4, 6, 7 |
| 35 |
2-6-0 |
35,000 |
5900 |
2, 3, 5, 8, 9-12 |
| 37 |
4-4-0 |
37,000 |
4800 |
16-18 |
| 38 |
4-4-0 |
37,000 |
5700 |
26, 35, 36, 88-91 |
| 40 |
2-6-0 |
40,000 |
7000 |
13-15, 19, 20, 23, 24, 27-29 |
| 42 |
4-4-0 |
40,000 |
6400 |
85-88, 92-96, 99-101 |
| 42.5 |
4-4-0 |
44,000 |
6400 |
107-109 |
| 45 |
2-6-0 |
52,000 |
9600 |
150-154 |
| 45.5 |
2-6-0 |
53,000 |
10,000 |
158-165 |
| 46 |
4-6-0 |
56,000 |
10,100 |
155, 157 |
| 48 |
0-6-0 |
48,000 |
10,100 |
21, 97, 98, 103-106 |
| 56 |
2-8-0 |
56,000 |
12,000 |
25, 31-34, 37-40, 43-84 |
| 60 |
2-8-0 |
60,000 |
13,000 |
22, 41, 42 |
| 75 |
2-8-0 |
69,000 |
16,300 |
412-414 |
| 76 |
4-6-0 |
78,000 |
12,600 |
500-502 |
| 104 |
4-6-0 |
78,300 |
12,600 |
503, 504 |
| 124 |
4-6-0 |
124,00 |
17,600 |
550-552 |
After the ownership change in 1924, a classification system was adopted that
was based on wheel
type and tractive effort. In the new system, the class was represented by using a letter
for the locomotive wheel type, followed by a number to represent the tractive effort. Thus,
a Mikado wheel type with 37,000 pounds of possible tractive effort was classed as K-37.
New 1924 Classification Letter Meanings
Class
Letter |
Engine
Type |
Wheel
Type |
| S |
Six Wheel |
0-6-0 |
| G |
Mogul |
2-6-0 |
| T |
Ten Wheel |
4-6-0 |
| C |
Consolidated |
2-8-0 |
| K |
Mikado |
2-8-2 |
| P |
Pacific |
4-6-2 |
| M |
Mountain |
4-8-2, 4-8-4 |
| F |
Santa Fe |
2-10-2 |
| L |
Articulated |
2-6-6-2, 4-6-6-4, 2-8-8-2 |
Class and road numbers following 1924 reclassification
| Class |
Wheel |
Road Numbers (7) |
| S-19 |
0-8-0T |
550-554 |
| S-23 |
0-6-0 |
805-807 |
| S-33 |
0-6-0 |
831-843 |
|
|
|
| G-20 |
2-6-0 |
805-826 |
| G-28 |
2-6-0 |
592-597, 940-943, 950-955 |
|
|
|
| Y-33 |
Shay |
4, 5 |
|
|
|
| T-12 |
4-6-0 |
166-177 |
| T-17 |
4-6-0 |
540-549 |
| T-18 |
4-6-0 |
506-538 |
| T-19 |
4-6-0 |
712-718 |
| T-24 |
4-6-0 |
740-743 |
| T-26 |
4-6-0 |
700-711 |
| T-28 |
4-6-0 |
720-739 |
| T-29 |
4-6-0 |
760-793 |
| T-31 |
4-6-0 |
1001-1010 |
|
|
|
| P-44 |
4-6-2 |
1000-1006 |
|
|
|
| C-14 |
2-8-0 |
553 |
| C-16 |
2-8-0 |
200-223, 240-295, 680-681 |
| C-17 |
2-8-0 |
417-422, 554, 555 |
| C-18 |
2-8-0 |
424-429 |
| C-19 |
2-8-0 |
400-411 |
| C-21 |
2-8-0 |
430-431 |
| C-25 |
2-8-0 |
432 |
| C-26 |
2-8-0 |
630-672 |
| C-28 |
2-8-0 |
555-629 |
| C-38 |
2-8-0 |
960-963 |
| C-39 |
2-8-0 |
916-925, 958 |
| C-40 |
2-8-0 |
980-984, 990-994 |
| C-41 |
2-8-0 |
901-915, 1101-1130 |
| C-42 |
2-8-0 |
970-973 |
| C-48 |
2-8-0 |
1131-1199 |
|
|
|
| K-27 |
2-8-2 |
450-464 |
| K-28 |
2-8-2 |
470-479 |
| K-36 |
2-8-2 |
480-489 |
| K-37 |
2-8-2 |
490-499 |
| K-59 |
2-8-2 |
1200-1213 |
|
|
|
| M-64 |
4-8-4 |
1700-1713 |
| M-67 |
4-8-2 |
1501-1510, 1521-1530 |
| M-68 |
4-8-4 |
1800-1804 |
| M-69 |
4-8-2 |
1550-1553 |
| M-75 |
4-8-2 |
1600-1609 |
| M-78 |
4-8-2 |
1511-1520 |
|
|
|
| F-81 |
2-10-2 |
1400-1409 |
|
|
|
| L-62 |
2-6-6-2 |
1050-1057 |
| L-76 |
2-6-6-2 |
3350, 3351 |
| L-77 |
2-6-6-2 |
3360-3375 |
| L-96 |
2-8-8-2 |
1060-1075 |
| L-97 |
4-6-6-4 |
3800-3805 |
| L-105 |
4-6-6-4 |
3700-3714 |
| L-107 |
2-8-8-2 |
3500-3509 |
| L-109 |
2-8-8-2 |
3550-3564 |
| L-131 |
2-8-8-2 |
3600-3609 |
| L-132 |
2-8-8-2 |
3610-3619 |
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