| 1/00 | Steam locomotives or railcars (characterised by power transmissions B61C 9/00; engines F01; boilers F22B) |
| 1/02 | Steam locomotives or railcars (characterised by power transmissions B61C 9/00; engines F01; boilers F22B) of articulated construction; with two or more engines (appliances of booster engines B61C 15/02) |
| 1/04 | Steam locomotives or railcars (characterised by power transmissions B61C 9/00; engines F01; boilers F22B) with steam accumulators (steam accumulators F01K) |
| 1/06 | Steam locomotives or railcars (characterised by power transmissions B61C 9/00; engines F01; boilers F22B) Streamlining (of coachwork B61D) |
| 1/08 | Steam locomotives or railcars (characterised by power transmissions B61C 9/00; engines F01; boilers F22B) Arrangement or disposition of combustion apparatus or accessories therefor |
| 1/10 | Steam locomotives or railcars (characterised by power transmissions B61C 9/00; engines F01; boilers F22B) Arrangement or disposition of steam generators |
| 1/12 | Steam locomotives or railcars (characterised by power transmissions B61C 9/00; engines F01; boilers F22B) Arrangement or disposition of condensers |
| 1/14 | Steam locomotives or railcars (characterised by power transmissions B61C 9/00; engines F01; boilers F22B) Arrangement or disposition of exhaust apparatus |
| 3/00 | Electric locomotives or railcars (characterised by power transmission B61C 9/00; electrical features B60L, H02) |
| 3/02 | Electric locomotives or railcars (characterised by power transmission B61C 9/00; electrical features B60L, H02) with electric accumulators |
| 5/00 | Locomotives or motor railcars with IC engines or gas turbines (characterised by power transmission B61C 9/00; engines F02) |
| 5/02 | Locomotives or motor railcars with IC engines or gas turbines (characterised by power transmission B61C 9/00; engines F02) Arrangement or disposition of intakes and apparatus for supplying, circulating, or filtering air for combustion or engine-cooling purposes |
| 5/04 | Locomotives or motor railcars with IC engines or gas turbines (characterised by power transmission B61C 9/00; engines F02) Arrangement or disposition of exhaust apparatus |
| 7/00 | Other locomotives or motor railcars characterised by the type of motive power plant used; Locomotives or motor railcars with two or more different kinds or types of motive power |
| 7/02 | Other locomotives or motor railcars characterised by the type of motive power plant used; Locomotives or motor railcars with two or more different kinds or types of motive power Locomotives or motor railcars with pneumatic accumulators |
| 7/04 | Other locomotives or motor railcars characterised by the type of motive power plant used; Locomotives or motor railcars with two or more different kinds or types of motive power Locomotives or motor railcars with two or more different kinds or types of engines, e.g. steam and IC engines |
| 8/00 | Filling stations for steam- or pneumatic-accumulator locomotives or motor railcars |
| 9/00 | Locomotives or motor railcars characterised by the type of transmission system used; Transmission systems specially adapted for locomotives or motor railcars (machine elements F16) |
| 9/02 | Locomotives or motor railcars characterised by the type of transmission system used; Transmission systems specially adapted for locomotives or motor railcars (machine elements F16) Transmission systems in or for locomotives or motor railcars with reciprocating-piston steam engines |
| 9/04 | Locomotives or motor railcars characterised by the type of transmission system used; Transmission systems specially adapted for locomotives or motor railcars (machine elements F16) Transmission systems in or for locomotives or motor railcars with reciprocating-piston steam engines consisting of cranked axles and coupling-rods |