In the previous report, the author demonstrated, using two kinds of questionnaire, that baggage conductors were faced with health problems resulting from their evening and night works and from poor working environmental conditions such as noise, vibration and shock.
In this report, the author wants to show another research in which noise, vibration and shock in the caboose were measured in order to compare the environmental conditions with the results of health questionnaires.
The results are as follows ;
1. There were measured much more times of shock in the caboose than in the baggage car of the express train. Model “YO” of caboose had twice the shock in frequency of Model “KOKIFU” of caboose.
2. As to the strength of shock, more powerful shock was measured in Model “YO” than in Model “KOKIFU” or in the baggage car of the express train.
3. The vibration in these two kinds of caboose and in the baggage car exceeded the “allowable limit of vibration as a vehicle” reported by Oshima, and that of Model “YO” was even beyond the “limit of uncomfortable vibration” reported by. Meister.
4. As to noise, the baggage car of the express train had lower level of noise than these two kinds of caboose. The noise of these two kinds of car were beyond the threshold limit of noise in industry.
5. The results of the environmental investigation showed that baggage conductors on board the caboose pointed out correctly their poor working conditions in the answer to the questionnaire.

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It may be concluded from the discussion of the literatures that there are not a few business machine operators suffering from occupational health impairment as a result of cummulative fatigue related with working conditions. Therefore, an investigation of work loads and occupational health impairment in business machine operators was carried out to ascertain the relationship between the former and the latter. The results thus obtained are as follows.
1) The nature and the responsibility of the work have effects on the punching rapidity of motion in key-punchers.
2) Occupational health impairment was found in the operators who got higher rapidity of punching. motion at an early stage and performed larger amount of work than the fellow workers. Therefore, it is desirable that the rapidity of punching motion and the work amount should be decreased to prevent health impairment.
3) Typists having more than five actual working hours a day showed a high percentage of health impairment and those having two and a half hours a day showed a low percentage.
4) The responsibility and the superintendence of the work have effects on the fatigue in business machine operators.
5) It is desirable that the working hours are absolutely shortened and that the operators have the work different from punching and typing, if they are not permitted to take a rest at free will accordingly to their feeling of fatigue.
6) It was apparent that occupational health impairment in business machine operators could fortunately not progress owing to their retirement from office because of miscellaneous reasons.

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