an Entity references as follows:
The Meitetsu 6000 series (名鉄6000系) is a commuter electric multiple unit type operated by Nagoya Railroad (Meitetsu) in Japan since 1976. In the narrow sense of the word, the 6000 series is the type produced from 1976, but in the broad sense, it includes later series, namely the 6500 series, and the 6800 series.