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The Advantages of the 40 Ft Tunnel Container Also known as double door containers or , 40 ft. These HC DDDCs are a foot higher than a standard cargo containers and have double doors at both ends. They can be shipped by train, truck or ship. The dual access point allows for seamless loading and unloading in warehouses or shipping yards, as well as during transport. The heightened design also increases storage capacity. Storage Space A 40-foot tunnel container comes with two sets of double doors, whic