Hi, boudicca - I have THREE!!! (My MIL used to be a fanatical knitter when the kids were small ):
One has Fat Controller rear view plus front half of engine (photo has James but it could be any colour of course) - plain back;
one is blue, with a big sun on one shoulder, a train signal and the front of an engine (Percy this time) smiling with steam coming out of his funnel, and on the back a moon and some stars with Percy asleep;
the third is Bill and Ben - a yellow jumper with black and red bits, faces on front and back, and the words Bill on one sleeve and Ben on the other.
Size range is 20-26, except for the first which is 20-28.