In response to world-wide concern over the depletion of the ozone layer and global warming, international agreements are in place to limit the emissions of the responsible gasses. Fluids widely used in refrigeration systems are amongst the chemicals responsible for the problems. The air conditioning systems used in most railway applications experience high levels of emissions and have poor records of reliability and performance. There are thus a number of incentives for the rail sector to develop improved passenger vehicle air conditioning systems. This paper looks briefly at some possible systems and gives some information of the benefits of adopting the air cycle for railway applications.
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