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美国Vapor公司介绍了一种能增加现有机车牵引力的牵引控制装置(简称PTC装置)采用这种装置的优点是:用相同数量的机车可牵引更多的货车,增加牵引定数;降低每吨公里的燃油消耗;消除机车的同步滑动;减少牵引电动机的故障以及具有较好的工作时间性能等。在装有PTC装置的GP40-2型机车上所做的标准试验表明,其牵引力由50000磅增加到68000磅,即增加了15％。其它类似的试验表明,有的甚至增加得更多。当牵引力最大时,车轮的可控蠕动,在1/2～2英里/小时的范围内,通常是允许的。
Vapor introduced a traction control device (referred to as PTC device) that can increase the traction of existing locomotives. The advantages of adopting such a device are as follows: the same number of locomotives can draw more trucks and increase the number of traction; reduce the output per ton of kilometers Fuel consumption; eliminate synchronous sliding locomotive; reduce traction motor failure and have better working hours performance. Standard tests on a GP40-2 locomotive fitted with a PTC unit showed that its traction increased from 50,000 pounds to 68,000 pounds, an increase of 15%. Other similar tests showed that some even increased even more. When the traction is maximum, the wheel’s controllable creep, in the range of 1/2 to 2 miles per hour, is usually permissible.