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| hours in operation (Forward Speed, Engine RPM, up to 2 Shaft Speed Inputs. (depending on the particular installation), and Engine Hours in operation. Alexander Demidov); service hours (By July 1961, the locomotives had accumulated 400,000 engine service hours. Alexander Demidov) | |||
| YOS (катализатор; years-on-stream konstmak) | |||
| operating time (двигателя); running time (агрегата) | |||
| elapsed time; run time (двигателя) | |||
| exploitation time | |||
| operating time (petr1k) | |||
| время наработки: 49 phrases in 18 subjects |