西班牙窄轨铁路正在采用车载式轮线润滑系统。这种系统使用固体润滑胀，与液体润滑脂相比具有一系列优点，不存在生态污染问题。在西班牙窄轨铁路上已有14列列车装用了固体润滑脂系统，预计每年可节约7000万美元。第一年节约效果已超过5000万美元。轮缘磨耗降低了72%。机车车辆 The Spanish narrow-gauge railway is using an on-board wheel lubrication system. This system uses solid lubrication to expand and has a number of advantages over liquid greases without the problems of ecological contamination. In the Spanish narrow-gauge railway 14 train has been equipped with a solid grease system, estimated annual savings of 70 million US dollars. The first year of savings has more than 50 million US dollars. Flange wear reduced by 72%. Rolling stock