zhè / tiáo / xiàn / lù / yǐ / jīng / huàn / chéng / diàn / lì / jī / chē / yùn / xíng / sù / dù / bǐ / yǐ / qián / kuài / le / hěn / duō

这条线路已经换成电力机车，运行速度比以前快了很多。

This route has switched to electric locomotives, which run much faster than before.