It appears that Lego is currently not making many Lego train sets at the moment. I'm not holding my breath either, as I doubt any new kits are coming out in the next new months. Lego is pushing new kits such as the Atlantis and Toy Story themed kits to the detriment of the more traditional train sets.
It's a shame, since all the trains seem to sell out over Christmas, which definitely indicates a demand that out stripped supply.
Let's hope some new kits are being designed and manufactured for the latter half of 2010... watch this space.