San Francisco is known for its iconic cable cars and trolleys, which are two of the most popular forms of transportation in the city. The term 'TROLLEY' is a seven-letter word that refers to a streetcar or light rail vehicle that runs on tracks along the streets. Cable cars, on the other hand, are eight-letter words that refer to a type of public transportation system that uses a cable running beneath the street to pull the cars up and down steep hills. Both of these forms of transportation have been around since the late 19th century and are still used today to get around San Francisco.