SECU, Stora Enso Cargo Unit, is a type of container built to transport bulk cargo like paper of railway and ship.

A SECU looks like an 40 foot ISO-Container but is bigger, 13.8 * 3.6 * 3.6 m and can take 80 tons of cargo. This compared with the 12.2 * 2.7 * 2.4 m with 26.5 tons of cargo for the ISO-Container.

A SECU is too big and heavy to be transported on road (ISO-Containers are designed to fit roads), and they are transported by railway and ship. A special vehicle or crane is used to load and unload them. Special railcars are also needed. They can be transported on truck ferries.

They are invented and used by Stora Enso (forest and paper company). The ports used are mainly Kotka, Göteborg, Zeebrugge, Tilbury and Immingham.

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