 The city's main manufacturing industries include companies involved in; shipbuilding, engineering, construction, brewing and distilling, printing and publishing, chemicals and textiles as well as newer growth sectors such as optoelectronics, software development and biotechnology.Glasgow forms the western part of the Silicon Glen high tech sector of Scotland with consumer electronics companies such as RHA Technologies headquartered.Glasgow has a large urban transport system, mostly managed by the Strathclyde Partnership for Transport (SPT).