H. Roy Cullen , H. L. Hunt , Sid W. Richardson , and Clint Murchison were the four most influential Influence businessmen during this era .

A public inquiry into the crash by Lord Cullen was held Hold in 2000 .

The Cullen inquiry was carried out Action in two blocks of sittings , sandwiching the 'joint inquiry ' ; the first block dealt Resolve_problem with the accident itself , the second block dealt Resolve_problem with the management and regulation of UK railway safety ; this had always been part of the inquiry terms of reference , but was given Giving additional urgency by a further train crash at Hatfield in October 2000 .