sentences:  In Japan, passenger trains without a conductor are indicated by a green sign, often accompanied by a pre-recorded in-car announcement mentioning that the train is a "one man train".Most buses are one-man operations, with an increasing number of subways, including the Nagahori Tsurumi-ryokuchi Line, which was designed to operate on one-man operation, Toei Ōedo Line, which was one-man operated since its opening in the year 1990, and the Tokyo Metro Marunouchi Line, which became driver-only operated from 2009.By 1997, more than 90 percent of all trains – both passenger and freight - operated by the then main freight and passenger rail operator in New Zealand, Tranz Rail, had only one person in the loco cab.