RER
Its called the "Metrolink Rapid Transit Tram System"
It stands for Mass Rapid Transit and it is the name of a Singaporean public train system.
The San Francisco Bay Area has a subway system called the Bay Area Rapid Transit, or BART. It serves the Bay Area as a whole, rather than San Francisco itself. San Francisco itself does not have its own rapid transit system, but it has a light rail system called MUNI that has underground sections.
Metro rail is a rapid transit system for metropolitan areas which can include subway systems, elevated rail systems, or light rail transit systems as part of its infrastructure. MetroRail is also the name given to the metro system in Houston, Texas.
IT's called the "T" -- short for MBTA which stands for "metropolitan Boston transit authority"
It is called the Metro.
OC Transpo is the name of the transit service for the city of Ottawa, Canada. The transportation services OC Transpo provides consist of regular street buses, rapid buses, light rail system known as O-Train, and a bus service for the disabled.
I heard that GM (under an alias company name) bought the companies up because they manufactured busses. In truth they were a nuisance to autombile traffic and the rapid movement of people between point A and Point B. As the system was designed and in place at the time that was probably true. Rapid transit in the future was not concived of and so goes Urban Planning.
Airtrain
I'm sorry, but I need more context to provide an accurate answer. Could you specify the location or transit system you are referring to?
Dan Paris's birth name is Daniel Paris.
Gladiator Paris's birth name is Paris, Douglas.