The trolley is an articulated frame 77 ft.
A car is suspended from the bridge, carried by a trolley running on the underside of the stiffening girders, the car being FIG.
Since 1895 electric railways operated by the trolley system have steadily developed, their mileage in 1909 approximating 895 m.
P. 35) has considered two cases-(a) a traction engine and boiler trolley, and (b) a traction engine and trucks loaded with granite.
The first trolley sleeping cars were those used on the Ohio and Indiana interurban railways.
Trolley haulage lacks the flexibility of steam or compressed air haulage, and is limited to main lines because the wires must be strung throughout the length of the line.
It is served by the Chesapeake & Ohio railway, and by trolley lines to Old Point Comfort and Newport News.
It is divided into three main districts, Upper, Middle and Lower Barmen, and is connected, throughout its length, with Elberfeld, by railway, tramway, and a suspended trolley line, hanging over the bed of the Wupper.
A service of electric tramways is maintained, notable as being the first system installed in England with a combination of the trolley and conduit principles of supplying current.
The girders weighing 2000 tons carry a double track for trains between the girders and on each side on cantilevers a trolley track, roadway and footway.
The street railways, underground trolley in the urban district and overhead trolley in the suburbs, connect at several points with interurban railways in Maryland and Virginia.
Electric locomotives usually work on the trolley system, though a few storage battery locomotives have been successfully employed.