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英国铁路为了适应其西海岸25千伏50赫芝电气化干线的需要,于1974年在它所属的Crewe工厂制造了35台87型机车,与此同时又订制一台具有相似机械结构的机车作为安装可控硅控制的样机。由于消除了分级调速对牵引力所引起的突变,使粘着重量得到更好的利用——再则固体电路能迅速地检测出车轮的打滑情况——这是采用可控硅的主要优点;减少维护是其第二个优点。另方面,可控硅的采用又必然会给信号和通信线路带来谐波的干扰。
In response to the need to supply its 25kv 50 Hertz electrified trunk line on the west coast, British Rail built 35 Type 87 locomotives at its owned Crewe plant in 1974, at the same time ordering a locomotive with a similar mechanical structure for installation SCR controlled prototype. Improved adhesion weight thanks to elimination of sudden changes in traction caused by stepped speed regulation - Solid-state circuits quickly detect wheel slip - Key benefits of using SCR; Reduce maintenance Is its second advantage. On the other hand, the adoption of thyristors is bound to bring harmonic interference to the signal and communication lines.