Editing Commuter rail (section)

==Hybrid systems==
{{Original research|section|date=June 2023|reason=Where are the sources that confirm this is an actual type of transit system? Where are the references that confirm each example is actually what is stated here?}}
Hybrid [[urban rail|urban]]-[[suburban rail]] systems exhibiting characteristics of both rapid transit and commuter rail serving a [[metropolitan region]] are common in German-speaking countries, where they are known as [[S-Bahn]]. Other examples include: [[Lazio regional railways]] in [[Rome]], the [[Réseau Express Régional|RER]] in France and the [[Elizabeth line]], [[London Underground]] [[Metropolitan line]], [[London Overground]] and [[Merseyrail]] in the UK. Comparable systems can be found in Australia such as [[Sydney Trains]] and [[Metro Trains Melbourne]], and in Japan with many urban and suburban lines operated by JR East/West and third-party companies running at metro-style frequencies. In contrast, comparable systems of this type are generally rare in the United States and Canada, where peak hour frequencies are more common. 

In Asia, the construction of higher speed urban-suburban rail links has gained traction in various countries, such as in India, with the [[Delhi–Meerut Regional Rapid Transit System|Delhi RRTS]], in China, with the [[Pearl River Delta Metropolitan Region intercity railway]], and in South Korea, with the [[Great Train eXpress]] system. These systems usually run on dedicated elevated or underground tracks for most of their route and have features comparable to [[Higher-speed rail]].