Editing Commuter rail (section)

===Track===
Their ability to coexist with freight or intercity services in the same [[Right-of-way (railroad)|right-of-way]] can drastically reduce system construction costs. However, frequently they are built with dedicated tracks within that right-of-way to prevent delays, especially where service densities have converged in the inner parts of the network.

Most such trains run on the [[List of track gauges|local standard gauge]] track. Some systems may run on a narrower or broader gauge. Examples of [[Narrow-gauge railway|narrow-gauge]] systems are found in Japan, [[KAI Commuter|Indonesia]], [[KTM Komuter|Malaysia]], [[Greater Bangkok commuter rail|Thailand]], Taiwan, Switzerland, in the [[Brisbane]] ([[Queensland Rail]]'s [[Queensland Rail City network|City network]]) and [[Perth]] ([[Transperth]]) systems in Australia, in some systems in Sweden, and on the [[:it:Ferrovia Genova-Casella|Genoa-Casella line]] in Italy. Some countries and regions, including [[Helsinki commuter rail|Finland]], India, Pakistan, [[Elektrichka|Russia]], Brazil and Sri Lanka, as well as [[San Francisco]] ([[Bay Area Rapid Transit|BART]]) in the US and [[Metro Trains Melbourne|Melbourne]] and [[Adelaide Metro|Adelaide]] in Australia, use [[broad gauge]] track.