In the middle bay this trolley consists of a four-wheeled light-frame
carriage, which will run on a conductor located in the pit. The
carriage has attached to it a flexible wire which can be connected to
the shoe-hanger of the truck or to the end plug of the car, so that
the cars can be moved around in the shops by means of their own
motors. In the north bay, where the pits are very shallow, the
conductor is carried overhead and consists of an 8-pound T-rail
supported from the roof girders.
The middle bay is provided with a 50-ton electric crane, which spans
all of the tracks in this shop and is so arranged that it can serve
any one of the thirty cars on the five tracks, and can deliver the
trucks, wheels, motors, and other repair parts at either end of the
shops, where they can be transferred to the telpherage hoist.
[Sidenote: _The
Telpherage
System_]
One of the most interesting features of the shops is the electric
telpherage system. This system runs the entire length of the north and
south bays crossing the middle bay or erection shop at each end, so
that the telpherage hoist can pick up in the main room any wheels,
trucks, or other apparatus which may be required, and can take them
either into the north bay for painting, or into the south bay or
machine shop for machine-tool work. The telpherage system extends
across the transfer table pit at the west end of the shops and into
the storehouse and blacksmith shop at the Seventh Avenue end of the
grounds.
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