Washington DC metro ambience - train arrives, distant announcement.
Late 30s male announcing "please hold on" at medium distance.
Late 30s male announcing "please hold on" with PA effect.
Late 30s male announcing "please hold on."
Late 30s male announcing "please stand clear, the doors are closing," at medium distance.
Late 30s male announcing "please stand clear, the doors are closing," briskly, with a PA effect.
Late 30s male announcing "please stand clear, the doors are closing," briskly.
Diesel electric freight train idling and glugging air blasts with faint operator voices in cab.