I have not found any comprehensive list of decoders by amps. But, I have seen 3 amp and 5 amp decoders in addition to 1, 2, and 4 amp decoders. TCS WOW, for example, is a 5 amp decoder.
If you Google, DCC x amp decoders, sunbstituting a number from 1 to 5 for the x, you will find most of the most common decoders listed.
Rich
Alton Junction
That is easy to determine. Check the websites for the different manufacturers. They all list the specs.
I know SoundTraxx has one, two and four amp decoders.
If you ever fall over in public, pick yourself up and say “sorry it’s been a while since I inhabited a body.” And just walk away.