I’m no expert but somewhere on here there’s a bunch of posts from people with good knowledge, outlining all the hurdles needed to overcome, on top of just building the station. Which would probably be millions on its own.
From memory some of the things mentioned were, a hugely expensive upgrade of the line to turn it from an infrequently used freight line to a passenger line. Signaling upgrade. And the actual availability of trains and train staff . Which they struggle to fulfill now.
There were other major drawbacks which I forget now, that don’t obviously come to mind.