I found the trouble finally, and the practical introduction on the Lehigh Valley road was the result. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
This system was used for a number of years on the Lehigh Valley Railroad on their construction trains. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
In 1888 the principle was successfully employed on 200 miles of the Lehigh Valley Railroad. Edward W. Byrn.十九世纪发明进展.
The various interests were combined in a corporation under whose auspices the system was installed on the Lehigh Valley Railroad, where it was used for several years. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.