跟齒軌嚙合。這樣機車便能克服黏著力不足的問題,把列車拉上達坡度達48%的陡峭斜坡。 Gear Nomenclature, Definition of Terms with Symbols. American Gear Manufacturers Association. : 72. ISBN 1-55589-846-7
Devices Sourcebook. 2007. ISBN 0-07-146761-0. Qualifying Bulk Metallic Glass Gear Materials for Spacecraft Applications (PDF). web.archive.org. May 20, 2019