In the Langen mono-rail the cars are hung from a single overhead rail; a line on this system works between Barmen and Elberfeld, about 9 m., the cars for a portion of the distance being suspended over the river Wupper.
Elberfeld-Barmen, although administratively separate, practically form a single whole.
Other principal centres of the silk trade in Rhenish Prussia are Viersen, Barmen, Elberfeld and Muhlheim.
This visit was followed by a return visit to Paris and a similar exchange of visits between the London City Corporation and the Paris Municipal Council, exchange visits Of the city corporations of Manchester, Glasgow and Edinburgh and Lyons, and a visit of the Manchester Corporation to Dusseldorf, Barmen and Cologne.
In length, it passes through the populous towns of Barmen and Elberfeld and supplies water-power to about five hundred mills and factories.