Coba jelasin Lihat juga dari Pengangkutan antara mod dalam bahasa melayu dong

DeBoer, David J. (1992). Piggyback and Containers: A History of Rail Intermodal on America's Steel Highway. Golden West Books, San Marino, CA. ISBN 0-87095-108-4.

Sidney, Samuel  (1846). Gauge Evidence: The History and Prospects of the Railway System. Edmonds, London, UK. No ISBN.