Definitions from Wiktionary (RER)

▸ noun:  A type of railway system that generally runs from suburbs or satellite towns into a city centre, with a central tunnel or overground corridor with higher speeds and more widely spread stations than a subway or metro.
▸ noun:  Any of many RER systems in French-speaking countries.
▸ noun:  GO Expansion, a project to improve commuter rail in Ontario.



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