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A computationally efficient engineering model to predict adhesion in rolling contact in the presence of water is presented which may be implemented in multibody dynamics software or in braking models to study train performance and braking strategies. This model has been developed in a project funded by the Rail Safety and Standards Board (RSSB) and Network Rail. It is referred to as the water-induced...
Ghrelin has been shown to mediate food and drug reward in rats and mice, and the rewarding properties of sweet foods and alcohol are known to contribute to overconsumption of these substances.To investigate the effects of GHS-R1A antagonism in a novel animal model of high alcohol consumption, the prairie vole, and to characterize the role of ghrelin in limited access consumption of a drug (alcohol)...
Low adhesion affects rail networks around the world. A recent unpublished study by Network Rail has shown a strong correlation between low adhesion incidents and the occurrence of the dew point. It is hypothesised that at or below the dew point water vapour from the air condenses onto the railhead forming a fluid film that leads to a loss of traction within the wheel/rail contact. It has been proposed...
Tests have been carried out to assess the performance of ten different grease types used as curve lubricants. All greases tested have been designed for wayside flange lubrication and some are currently used on the UK’s rail network. Each grease's performance was assessed in terms traction coefficient, retentivity (how long a fixed amount of grease provided lubrication), and wear. Two series of tests...
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