I have purchased both the Shay and Porter with sound, I cannot say about the others.
Check out The Favorite Spot.com
Trust this helps
Rod.

I have a friend that is constructing a new HOn3 layout and has purchased several of these locomotives. They look, run and sound fantastic. Go for it.

Hi
I have successfully used a product sold by Humbrol called "mask-all" It is like a rubberised paint that you apply carefully to the windows before painting either by air brush or paint brush. Let the "mask-all' dry, paint your trim and once the paint has dried you just get a #11 exacto blade in a corner of the window and peel the "mask-all" away. It a great product. I use it all of the time. And it lasts for years in the bottle.
Have fun

Rod.

Good news my Gas Mech now runs as good as it should. I was told by a hobby shop not to fit the capacitor, bad mistake. The one supplied with the sound decoder was installed and hidden in the cab under a 44 gallon drum yesterday and it fixed my problem. So the decoder is now hard wired to the motor has a large aluminium heat sink and the capacitor and working very well.
Thanks to those who have made suggestions.
Rod

Have you considered using decals. I have used them for many years on my N Scale equipement and they are much better than dry transfers. Just take a little time and they look as if they are painted on once dulcote is applied . Micro Scale industries has a huge range of alphabet and numbers in HO and O scale in a range of colours.

Thanks lads for your input. As it is going to be 40 degrees C here in Melbourne Australia today I will not be venturing out to the layout to try your suggestions. Maybe tomorrow.

Does any one have information about the fitting of a Tsunami TSU 750 sound decoder into a Gas Mech. I have one fitted and whilst the sound is very good the loco stops and starts especially when moving over frogs and rail joints. It was getting hot and shutting down, that has been fixed by hard wiring the decoder and fitting a heat sink. It now runs much better but still nowhere as it should. My track is ME code 83 and very clean. I have run my new DCC equipped Gas Mech on the same track and it runs like a Swiss watch over all frogs and rail joints. I am at a loss as to the problem. Can anyone help?
Thanks