Thanks for the info Graham,
I have just been looking at some photos of the Welsh Dragon ( Push Pull Rhyl - Llandudno) which I was a frequent rider when on hols in Llandudno back in the 50s/60s, I note the cab end has a Horn fitted so presume this must have been worked with compressed air, although in all the times I rode that train I cant recollectever hearing it!.
Now then Bachmann how about a LMR Push Pull set from yourselves ( would go nicely with the Ivatt 2MT )