Hello everyone, Is there a word for urban heavy rail systems in your language? Such as "metro", "subway", "underground", "urban train", etc? To be clear, "urban heavy rail systems" are intracity trains that run very frequently (at least every 15 minutes even on weekends), are completely separated from road traffic by either being underground or elevated, and have high capacity. They're different from light rail / streetcars that are lower capacity and may cross roads requiring cars to stop for them, and they are also different from commuter rail systems in that commuter rail systems don't run all day and are generally very infrequent (once every half hour or hour), often share train tracks with freight trains, and go from the city to far suburbs and generally more expensive. Does/do the word(s) in your language depend on whether the train is above ground or underground, and are there words specific to a city? I'm curious as to what languages whose native region don't contain such urban trains call these trains. In English, the word used depends on the city. You generally don't call the NYC subway the "Underground", nor would you call the Washington Metro train the "subway". Some cities that have a mixture of heavy rail and light rail systems use the same word for both, e.g. the Boston "T".