Called for since the 1930's eh? Hmm. Other sources seem to suggest that planning permission was only granted in August 2007. So if it does open in June 2008, that's going to be an incredibly quick turnaround time, compared with the new Shepherds Bush station for the Westfield shopping centre.

I think you can describe any imaginary piece of transport infrastructure as "called for since the 1930's". Even the A3 Hindhead Tunnel has apparently only been called for since the 1970's, despite the fact that the road which is now the A3 has existed since 1826.

I'm never sure of safety of stations near level crossings, because commuters in a hurry are inevitably going to try to use the crossing when running to catch trains. But presumably that's been thought about. There are very few major railway stations that are not close to busy main roads, since both road and rail traffic tends to need to go to the same places; you don't need to have a level crossing for there to be road safety problems near a railway station.