A planning inquiry has opened into three schemes for a rail freight terminal at different sites in Bedfordshire and Hertfordshire.
Developers have submitted a new scheme for Radlett Aerodrome near St Albans despite rejection of plans in 2007.
They have also tabled two alternative schemes both in Bedfordshire.
One is for Upper Sundon, near Luton, the other is near junction 12 of the M1 at Harlington on land owned by former Luton Town FC chairman Cliff Bassett.
The planning inquiry is being held at council offices in St Albans.
New plans submitted
A further plan submitted by developers HelioSlough Limited was for a rail freight interchange on a 1,035 acre (419 hectare) site on the North Orbital Road at St Albans.
St Albans City Council rejected this proposal because the development would be in the green belt and this is the basis of their objection to the current scheme for Radlett Aerodrome.
In 2008 the Secretary of State ruled that an appeal in support of the previous proposal be dismissed and planning permission refused but submission of other suitable sites should be considered.
Helioslough said a freight terminal serving London and south east would be an asset and have now presented schemes for consideration.