6Lopez Gomez J L,Lacasta Alsa J. Talgo automatic gauge change system for freight wagons[J]. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 2001,215 ( 1 ) : 13-24.
8Noriaki Tokuda,Isao Okamoto,Toyoshi Fujita,et al. Development of Gauge Change Bogies[J]. QR of RTRI, 2003,44(3 ) : 109-113.
9Schiefelbusch M. Developments in Kassel. Pt.2: Kassels newest tram: the first to use EEF [Einzelrad-Einzel-Fahrwerk:self-steering single wheell running-gear[J]. Modern Tramway and Light Rail Transit, 1991, 54(12) :399-406.
10Harry Hondius. Variety returns as orders fall away[J]. Railway Gazette International, 2007 (1).