Hello.
I have some TTS decoders, but I'm not sure which locos they are for. They have 4 different numbers written on the black round bit. The numbers are:- 10, 17, 28, & 34. I've looked on eBay at what is for sale and has been sold, and I think no. 10 is an A1/A3, no. 17 is an A4, but I haven't seen examples of nos. 28 and 34.