During the 1930s the staple locomotive power on the S&MJR appears to have been the Midland 3F 0-6-0 and several were allocated to the Stratford Old Town shed. As we have come to expect, Mike Musson's warwickshirerailways.com has plenty of evidence of various locomotives but generally the actual numbers are not legible on the older photos. There is one:

http://warwickshirerailways.com/lms/smjsa77.htm

which shows several 3Fs on shed. The one to the right matches the Bachmann model, but the number is not legible. I have asked Mike to check for me and he is going to see if the original has higher definition. Finger's crossed. Here is the Bachmann model which will be transformed into the Stratford prototype:

The Midland tender has a stiffening frame running down the center of the tender.

I was wondering how the three letters L M S should be applied. Old photos generally show the M to be to the rear of the strap, so that is where the transfer(s) will be applied. Incidentally, I don't know how the tender coal rail got bent but it seems reasonable to leave it that way!