Maxitrak, makers of live steam models, have just completed a series of 5″gauge Fowler 4Fs. 44422 was used as the loco number. The first batch of have now all been sold and Andy Probyn, from Maxitrak, has very kindly donated £100 towards the overhaul of 44422.
Details can be found on http://www.maxitrak.com.
A video of the model working can be found at http://www.youtube.com/watch?v=IdgFlWR2ac0&feature=player_detailpage