The design proved so successful, that in the early 1980s Ford again approached Cargowaggon for a new design, this time a slightly longer twin-axle sliding door all metal van, which was adapted by British Rail to become the VGA. So successful was the project for Cargowaggon, they extended the project. The problem of the twin axle design was that although its short length meant that it easily fitted on the cross-English Channel rail ferry, its long wheelbase restricted the minimum radius on which it could be used. The resultant longer length wagon, based on a twin EVA bogie, twin axle design, the IGA spawned three basic variants:  The Cargowaggon IGA is now the most commonly used trans-European railway wagon, particularly popular since the opening of the Channel Tunnel, resulting in a design which has been improved over the developing years as opposed to replaced.