蒸汽机车在我国南方地区夏季进行调车,作业任务重,劳动条件差。而且调车机车与长途牵引机车有所不同,因运行区间短,速度慢,时常处于牵、停、推、拉的慢动作。在环境气象条件恶劣的情况下,难以进行全面的自然通风,在禁行待命时司机室内风速0.3～0.7m/sec,温度达到36～40℃, Steam locomotive shunting in summer in southern China, heavy task, poor working conditions. And shunting locomotives and long-distance traction locomotive is different, because of the short operating range, slow speed, often in the pull, stop, push, pull slow motion. Under the circumstance of bad weather and environment, it is difficult to carry out full and natural ventilation. The wind speed in the driver’s cab is 0.3 ~ 0.7m / sec when the forbidden line is on standby, the temperature reaches 36 ~ 40 ℃,