| The kind of main engine is indicated by one of the following abbreviations and in case where plural sets of main engines are installed, a figure corresponding to the number is indicated before the abbreviation for the kind of engine. |
| D |
Diesel Engine |
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| E |
Electric Motor |
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| T |
Steam Turbine |
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| In case of diesel engines, details such as cycle, acting and the number of cylinders are indicated; for example, |
| 2 SA 6 CY |
2 Stroke Single Acting, 6 Cylinders |
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| 2 DA 6 CY |
2 Stroke Double Acting, 6 Cylinders |
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| 4 SA 6 CY |
4 Stroke Single Acting, 6 Cylinders |
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| In case of steam turbines details are indicated; for example, |
| HP & LP drg |
High pressure and low pressure cross compound turbine with double reduction gearing |
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