Of course - they were going to pay several million pounds or more (in the USA they reckon $ 1- $ 2 million per mile for a new track) to an airport that has no proven demand.........
Say 1900 Pax a day as per plan. Even a small train takes 200 pax a trip - a Javelin takes 300- 350 a trip. so even if ALL your pax arrive by train that's 6-10 trains a day - one per hour in daylight............... that isn't viable for anyone I'm afraid especially as even airports with good links (NCL for example) only handle 10-20% of pax using the airport