An international forum for garden railway modellers in all scales and gauges. It is free to join and is funded through voluntary contributions by its members. Many thanks to all those who keep it going.
I suggest you try this company... they make castings for model steam locomotives in various scales and I have used them (even visited their wonderful workshop in the West Midlands) and they are extremely helpful.
There are several 'real' ones listed on ebay ( search Aveling invicta), although they would be too big and heavy for what you want. However you could use those pictures to hand craft a replacement tail to fit on to yours.