| Class | Wheel Arr. |
Dr. Dia. |
Cylinders Dia. xStroke |
Boiler Press. |
Ad. Wt. |
EW WO |
Grate Area |
Evap. Surface |
Sup. Surface |
Remarks |
| D | 4-6-0 | 57in | 18x24in | 150psi | 40t | 52t | 23sq.ft. | 1700sq.ft. | none | |
| F3 | 0-6-0 | 51in | 20x26in | 180psi | 65t | 65t | 28sq.ft. | 1985sq.ft. | none | B&O D-44 |
| F4 | 0-8-0 | 52in | 24½x28in | 185psi | 106t | 106t | 50sq.ft. | 3140sq.ft. | 725sq.ft. | B&O L-4 |
| LL | 2-6-6-2 | 57in | 23½/37x32in | 200psi | 167t | 202t | 72sq.ft. | 4925sq.ft. | 1045sq.ft. | B&O KK-4 |
| PR | 2-8-0 | 48in | 18x26in | 180psi | 57t | 61t | 24sq.ft. | 1600sq.ft. | none | B&O E-51 |
| S | 4-8-0 | 54in | 21x26in | 180psi | 66t | 78t | 30sq.ft. | 2300sq.ft. | none | |
| S2 | 4-8-0 | 55in | 20x26in | 200psi | 60t | 72t | 32sq.ft. | 2300sq.ft. | none | |
| S2R | 2-8-0 | 55in | 20x26in | 200psi | 65t | 75t | 32sq.ft. | 2300sq.ft. | none | B&O E-42 |
| V2 | 2-8-0 | 56in | 22x28in | 200psi | 70t | 78t | 47sq.ft. | 2825sq.ft. | none | B&O E-58 |
| V3 | 2-8-0 | 56in | 22x28in | 200psi | 71t | 79t | 54sq.ft. | 2800sq.ft. | none | B&O E-58A |
| W | 4-4-2 | 72in | 19½x26in | 200psi | 41t | 68t | 47sq.ft. | 2760sq.ft. | none | GM&N 40 |
| W2R | 4-4-2 | 73in | 20¼x26in | 200psi | 53t | 89t | 54sq.ft. | 2535sq.ft. | 480sq.ft. | B&O A-6 |
| W3R | 4-4-2 | 72in | 19½x26in | 200psi | 46t | 80t | 46sq.ft. | 2320sq.ft. | 480sq.ft. | B&O A-7 |
| W4 | 4-4-2 | 73in | 20½x26in | 200psi | 48t | 86t | 54sq.ft. | 2900sq.ft. | none | Also W5 |
| W4R | 4-4-2 | 73in | 20½x26in | 200psi | 52t | 88t | 54sq.ft. | 2260sq.ft. | 450sq.ft. | B&O A-8 |
| W5R | 4-4-2 | 73in | 20½x26in | 200psi | 53t | 88t | 54sq.ft. | 2260sq.ft. | 450sq.ft. | B&O A-8A |
| WW | 4-6-2 | 73in | 24½x26in | 200psi | 74t | 117t | 56sq.ft. | 3625sq.ft. | 750sq.ft. | B&O P-17 |
| WW2 | 4-6-2 | 73in | 22½x28in | 200psi | 66t | 109t | 54sq.ft. | 2815sq.ft. | 650sq.ft. | B&O P-19 |
| X | 2-8-0 | 57in | 21x28in | 200psi | 74t | 83t | 54sq.ft. | 2865sq.ft. | none | B&O E-52 |
| XR | 2-8-0 | 57in | 21x28in | 200psi | 74t | 83t | 54sq.ft. | 2865sq.ft. | none | B&O E-53 |
| X2 | 2-8-0 | 57in | 21x28in | 200psi | 74t | 83t | 54sq.ft. | 2865sq.ft. | none | B&O E-53C |
| X2R | 2-8-0 | 57in | 21x28in | 200psi | 78t | 88t | 54sq.ft. | 2345sq.ft. | 475sq.ft. | B&O E-53B |
| X3 | 2-8-0 | 57in | 21x28in | 200psi | 77t | 86t | 54sq.ft. | 2865sq.ft. | none | B&O E-54 |
| X3R | 2-8-0 | 57in | 21x28in | 200psi | 81t | 91t | 54sq.ft. | 2345sq.ft. | 475sq.ft. | B&O E-55 |
| X4R | 2-8-0 | 57in | 21x28in | 200psi | 80t | 89t | 54sq.ft. | 2345sq.ft. | 475sq.ft. | B&O E-56A |
| X6 | 2-8-0 | 57in | 21x28in | 200psi | 76t | 86t | 54sq.ft. | 2865sq.ft. | none | B&O E-57 |
| X6R | 2-8-0 | 57in | 21x28in | 200psi | 80t | 89t | 54sq.ft. | 2345sq.ft. | 475sq.ft. | B&O E-57A |
| X7R | 2-8-0 | 57in | 21x28in | 200psi | 80t | 88t | 54sq.ft. | 2865sq.ft. | none | Ex X6 |
| XX | 2-8-8-2 | 57in | 28/44x32in | 200psi | 224t | 256t | 99sq.ft. | 6625sq.ft. | 1625sq.ft. | B&O EE-2 |
| Y | 2-10-0 | 52in | 24x28in | 210psi | 110t | 122t | 55sq.ft. | 3525sq.ft. | none | |
| YR | 2-10-0 | 52in | 24x28in | 200psi | 113t | 125t | 55sq.ft. | 2900sq.ft. | 625sq.ft. | B&O Y |
| Z | 2-8-2 | 63in | 26½x30in | 180psi | 98t | 124t | 56sq.ft. | 3625sq.ft. | 750sq.ft. | B&O Q-10 |
| ZR | 2-8-2 | 63in | 26½x30in | 190psi | 99t | 135t | 56sq.ft. | 3625sq.ft. | 750sq.ft. | Booster |
| 01 | 0-4-0T | 30in | 10x16in | 155psi | 17t | 17t | 9sq.ft. | 405sq.ft. | none | 2 foot gauge |
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