I am looking at a 84013 K4 4-6-2 the web site says min radius track is R18  but the Model train stuff website says min is R22

I see that engine is DCC ready, does the tender come with a speaker installed?

Is there another Bachman Loco around that size with DCC, Sound and Smoke that will run on 18R track?

I currently have a Mikado 2-8-2 that runs on my track but I want a larger engine that will also run on my track and track is all R18