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| Wheel Arrangement | French Notation | German Notation | US and UK Notation | US nicknames, also sometimes used elsewhere |
| Oo |
011 |
A1 |
0-2-2 |
|
| oO |
110 |
1A |
2-2-0 |
|
| oOo |
111 |
1A1 |
2-2-2 |
|
| ooO |
210 |
2A |
4-2-0 |
Jervis |
| ooOo |
211 |
2A1 |
4-2-2 |
|
| OO |
020 |
B |
0-4-0 |
|
| OOo |
021 |
B1 |
0-4-2 |
|
| oOO |
120 |
1B |
2-4-0 |
|
| oOOo |
121 |
1B1 |
2-4-2 |
Colombia |
| ooOO |
220 |
2B |
4-4-0 |
American |
| ooOOo |
221 |
2B1 |
4-4-2 |
Atlantic |
| ooOOoo |
222 |
2B2 |
4-4-4 |
Reading |
| OOO |
030 |
C |
0-6-0 |
|
| oOOO |
130 |
1C |
2-6-0 |
Mogul |
| oOOOo |
131 |
1C1 |
2-6-2 |
Prairie |
| oOOOoo |
132 |
1C2 |
2-6-4 |
Adriatic |
| ooOOO |
230 |
2C |
4-6-0 |
Ten-wheeler |
| ooOOOo |
231 |
2C1 |
4-6-2 |
Pacific |
| ooOOOoo |
232 |
2C2 |
4-6-4 |
Baltic or Hudson |
| OOOO |
040 |
D |
0-8-0 |
Switcher |
| oOOOO |
140 |
1D |
2-8-0 |
Consolidation |
| oOOOOo |
141 |
1D1 |
2-8-2 |
Mikado |
| oOOOOoo |
142 |
1D2 |
2-8-4 |
Berkshire |
| ooOOOO |
240 |
2D |
4-8-0 |
Mastodon or Twelve-wheeler |
| ooOOOOo |
241 |
2D1 |
4-8-2 |
Mountain |
| ooOOOOoo |
242 |
2D2 |
4-8-4 |
Niagara or Northern |
| OOOOO |
050 |
E |
0-10-0 |
|
| OOOOOo |
051 |
E1 |
0-10-2 |
Union |
| oOOOOO |
150 |
1E |
2-10-0 |
Decapod |
| oOOOOOo |
151 |
1E1 |
2-10-2 |
Santa Fe |
| oOOOOOoo |
152 |
1E2 |
2-10-4 |
Texas |
| ooOOOOO |
250 |
2E |
4-10-0 |
Gobernador |
| ooOOOOOo |
251 |
2E1 |
4-10-2 |
Overland |
| OOOOOO |
060 |
F |
0-12-0 |
|
| oOOOOOO |
160 |
1F |
2-12-0 |
Centipede |
| ooOOOOOOo |
261 |
2F1 |
4-12-2 |
Union Pacific |
| OOO+OOO |
030+030 |
CC |
0-6-6-0 |
Erie |
| oOOO+OOOooo |
130+033 |
1CC3 |
2-6-6-6 |
Allegheny |
| ooOOO+OOOo |
230+031 |
2CC1 |
4-6-6-2 |
Cab Forward |
| ooOOO+OOOoo |
230+032 |
2CC2 |
4-6-6-4 |
Challenger |
| oOOOO+OOOOo |
140+041 |
1DD1 |
2-8-8-2 |
Mallet |
| oOOOO+OOOOoo |
140+042 |
1DD2 |
2-8-8-4 |
Yellowstone |
| ooOOOO+OOOOoo |
240+042 |
2DD2 |
4-8-8-4 |
Big-Boy |
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