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Matt Glazewki
Auld Sodger

In the USA "trolley" is a regional colloquialism or sobriquet for streetcar (Brit: tram). The term trolley comes from the "trolley pole" which is the spring-loaded pole atop the streetcar which is pressed upwards against the under-side of the overhead wire, thereby allowing the 600v direct current to be delivered into the streetcar's electrical systemn and traction motors, the electric circuit is then completed through the steel wheels to the steel "running rails".

In the US the unique conduit system was used only Manhattan (NYC) and Washington DC.

A bit a clarification on the conduit system; it is often referred to as an underground third-rail system which is not correct, as there was an "underground" 3rd and 4th rail. Two special conductor "rails" of special "T" cross section were mounted on insulators below the street in the conduit (vault) flanking either side of the conduit slot.

by robspost on Jul 13, 2011 7:15 pm • link • report

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