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2022 Journal Impact Factor - 0.6
2022 CiteScore - 1.7




ISSN 2083-6473
ISSN 2083-6481 (electronic version)




Associate Editor
Prof. Tomasz Neumann

Published by
TransNav, Faculty of Navigation
Gdynia Maritime University
3, John Paul II Avenue
81-345 Gdynia, POLAND
Tworty Box to Improve the Equipment Logistics of Container Lines
1 Hochschule Bremen, University of Applied Sciences, Bremen, Germany
ABSTRACT: A major share of all empty container positioning (deadheading) is resulting from imbalances with regard to container sizes (20ft/40ft). In order to reduce the shipments of 'containerised air' a new type of container has been developed by the author: The Tworty Boxes can either be used as a standard 20ft or in coupled condition as a 40ft container. The outside appearance resembles any standard 20ft container. However the Tworty Box is unique in that it has an additional door at the front side that opens to the inside. This door can be fixed to the ceiling and by using of bonding elements another Tworty Box can be joined up, thereby creating the full 40ft inside space. Operated as a single 20ft box the additional door remains locked, access is only through the existing standard door. Tworty Boxes do not require any additional components and fulfil all ISO and CSC requirements.
DHL, Press Release, June 25, 2013.
Drewry Maritime Research, Container Market Review and Forecast, Annual Report 2012/13.
Drewry Maritime Research 2013. Container Forecaster.
Drewry Shipping Consultants 2012. Container Census – 2012.
Hapag-Lloyd AG 2010. Container Specification, Hamburg
Konings, R.& Thijs, R. 2001, Foldable Containers: A New Perspective on Reducing Container Repositioning Costs, TU Delft.
Malchow, U. 2013. Aus zwei mach eins. In: Deutsche Verkehrs-Zeitung. Dec. 10, 2013.
Port of Hamburg Magazine, 3/2013: 34-39
TWORTY BOX GmbH & Co. KG, Hamburg, website:, last accessed in Feb. 2014.
Citation note:
Malchow U.: Tworty Box to Improve the Equipment Logistics of Container Lines. TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, Vol. 10, No. 2, doi:10.12716/1001.10.02.15, pp. 323-330, 2016

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