I would be looking at the SoundTraxx Tsunami 2 1100 series decoder.
I prefer the SoundTraxx steam decoders over the LokSound's steam.
With 611 on the move, I'll be visiting Strasburg this summer to see my first mainline steamer. As such, I felt inspired to get my Bachmann Spectrum model of 611 repaired and install a sound decoder, but I've never installed a steam decoder. So... what would be the best one to install? Thanks!
Check out the Balfour and Colucci Creek Southern Railroad, my proto-freelanced N scale model railroad, at bccsrailroad.weebly.com or on Youtube on my channel, N Scale Train Boy.
-Dennis