Tender for a L&YR Class 27, 28 or a freelance variant 29.
 
They also come with a couple of tool chests that can be glued in various positions..
 
As well as 14mm wheels and axles (Alan Gibson brand recomended) they will need a chassis to complete.  4mm one's are available for £12 each although they are only a stop-gap to producing something more robust.  They work fine but in resin are a bit brittle so care is needed when threading wheels on to axles through the chassis etc, small 2mm spacing washers are a good idea too depending how much  lateral 'give' you want the wheelsets to have.  The chassis need a little filing before they fit well due to the MSLA printing process is all.
 
The completed photographs of the lined red example are of the now unavailable Shapeways WSF/WNVP material which is a bit grainy in texture.   SCC MSLA resin prints are a lot smoother by default.