What is the difference between a streetcar and a trolley?

Following on the above point about rubber tired vehicles disguised as trolleys, there can be confusion about the terms "streetcar" and "trolley" when referring to vehicles on rails. Through most of the 20th century the terms were essentially interchangeable—both describing an electrically powered car running on rails. However, local usage often favored one term over the other.

For example, in San Francisco the term streetcar has always been preferred, but in Philadelphia the term trolley has been more common. Today some people planning heritage lines are stressing preferential use of one of the two terms to minimize confusion and encourage consistency. In some cases, the word "streetcar" is preferred in order to clarify the difference between a streetcar operating on rails vs. a rubber tired vehicle made to look like a trolley.

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