Hi Jesus, Welcome to the forums, there are plenty of helpful folks here that can help you figure out most any situation you might come up against so feel free to ask any questions you may have, even if you don't quite know how to describe/explain it.
It sounds like you have or getting a fair fleet of Loco's built up. I mostly in steam and the only Diesels I have are the early AGEIR, Box Cab units by MDC/Roundhouse that are my track cleaners as they have two pads on each end that ride on the rail heads under spring tention to pick-up dirt & junk on their slightly abrasive surfaces. They do a great job too.
Be sure to drop by the ANPL Coffee Shop - Jefferys' Dinner and have a cup of coffee and Donut on me. Tell Flo or Francine to put it on my tab.