I love to run my 1 Legacy (NY Central 10 Wheeler steamer), MTH PS 2 and 3 locomotives on DCS (several diesels and several steamers), and the following conventional engines that run quiet: Lionel modern NY Central F3s, Lionel Postwar 773 (1964 version), MTH NY Central Mohawk steamer, Williams Jersey Central NW2 diesel and Williams NY Central F3s. I also have a very nice quiet running K Line GP38 Chesdue System diesel that is attractive and a fine puller.
I also have several LC+ engines that I love to run using the dedicated LC remotes or universal LC remote.
As I mentioned before, I limit the running of some of the modern engines with circuit boards, eventhough I love to run them. This is particularly true of the Legacy 10 wheeler and an MTH Proto 3 Long Island steam switcher.
The steam switcher, shown in the photo below, like other MTH Proto 3 steamers, has a sometimes problematic tether arrangement between the engine and tether. A connector needs to be fully seated in a socket for the engine to run. I have inserted a piece of clear plastic tubing to keep the connector fully seated.
The Legacy 10 wheeler, shown below, is simply my best engine IMO:
These favorites are my go to locomotives to entertain an audience, and I hope they will last at least as long as me without any need of repairs.
I run the above quiet conventional locomotives so as not to disturb my wife's sleep, and to pull 8 to 10 car trains (my limit because of reverse loops). Its no big deal to me if they break down.
Arnold