The performance of employees in a transport set is highly affected by their satisfaction and occupational problems. Underground metro drivers work in special conditions as compared with the drivers of suburban trains and urban tramways. Even though several studies have focused on the ergonomics of train drivers, there is a dearth of research on underground metro drivers. This study was conducted to investigate the factors affecting the underground metro drivers’ occupational problems such as depression and level of satisfaction. The study was carried out on underground metro drivers in Tehran, Iran. The required data were collected through interviews, self-report tests and a depression scale. The classification and regression tree (CART) model was used to measure the relationship among depression, different conditions and other demographic characteristics. By using hierarchical clustering, metro drivers were divided into two categories with desirable and undesirable levels of satisfaction with regard to varying levels of satisfaction in different fields. By labelling them and reusing the CART model, the most important parameters affecting the satisfaction of drivers were extracted. The results indicated that more than half of metro drivers were depressed. The most important factors in the incidence of depression were: resentment of some psychological factors such as dissatisfaction with loneliness in the cabin, stress and fear of an incident, fatigue, dissatisfaction with the resting place, work experience more than 3.5 years, dissatisfaction with rights and the need for a second job. Also, the most important factor affecting satisfaction was the quality of the resting place.

中文翻译：

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地下地铁司机：职业问题和工作满意度

员工在运输工具中的表现受其满意度和职业问题的严重影响。与郊区火车和城市电车的驾驶员相比，地下地铁的驾驶员在特殊条件下工作。尽管一些研究集中在火车司机的人体工程学上，但对地下地铁司机的研究却很少。这项研究旨在调查影响地下地铁驾驶员职业问题的因素，例如抑郁和满意度。该研究是在伊朗德黑兰的地下地铁驾驶员上进行的。通过访谈，自我报告测试和抑郁量表收集所需的数据。分类和回归树（CART）模型用于衡量抑郁症之间的关系，不同的条件和其他人口特性。通过使用分层聚类，就不同领域中的不同满意度而言，将都市驾驶员分为满意和不满意的两类。通过标记它们并重新使用CART模型，可以提取影响驾驶员满意度的最重要参数。结果表明，超过一半的地铁司机感到沮丧。抑郁症发生的最重要因素是：对某些心理因素的不满，例如对机舱内的孤独感，对事件的压力和恐惧，疲劳，对休息场所的不满，3.5年以上的工作经验，对权利的不满等。以及第二份工作的需要。也，