If you’ve run into Proto 2000 before, Proto 1000 usually comes up right after when you're going through HO scale trains for sale and want something a little more straightforward. They’re built to run well without getting overly detailed, which is why a lot of people end up using them for regular operation.
You still get good performance and solid models, just without all the extra parts and complexity. You can check out more from Life-Like or browse HO Scale trains when building out a working roster.