Companies that design or build the vehicles and rolling equipment other network entities operate, rather than operating transport services themselves. Belongs here: Boeing, Douglas Aircraft Company, British Aircraft Corporation and Sud Aviation among aircraft builders; Alstom and Starley & Sutton Co. among rail and cycle manufacturers; Harland & Wolff and Luftschiffbau Zeppelin among shipbuilders and airship builders; and TTX Company, a railcar-pooling equipment cooperative grouped here because its function is providing equipment rather than running scheduled service. Does not belong here: any company whose primary business is running transport service using equipment it did not necessarily build.