sentences:  Prior to this, automatic operation by ATO began from January 20, 2007.Before starting the one-man operation, door opening and closing is performed by a button on the cab that is pushed by the operator rather than the conductor.The PSDs were originally scheduled to start operations in February 2007, but the adjustment was delayed; they began operating at Azamino on April 7 and started to be used at all stations on September 15, 2007.