Thank you for the videos - your track work is really well done. If you don't mind, I wanted to ask which track you are using and how it holds up seasonally. Also, who manufactured the rolling stock. Your trains look great. Thank you.
The track is all Aristocraft stainless with track power using DC Bridgewerks packs.
Edit: it holds up well. Some surface rust that rubs off. Some ties were painted to see if they lasted longer. If you're in the southern climates, you may wish to paint them all to help with the sun rot.
The last video has silver coalporter cars made by AML. The rest behind are MTH.
The first videos have an assortment.
The first are freight are USA trains covered hoppers, then a LGB hopper, Aristo box cars, 2 more LGB hoppers, USA box cars,....
a mix of LGB, USA trains, Aristo, and MTH cars would be the best answer. I also have a few Accucraft 1/32 pass cars in storage.
Amtrak is a LGB Genesis pulling MTH. I need to swap out the couplers on the matching LGB Amtrak cars to use them now. I try and use KD couplers as a standard. I'm just past half way converting stuff. I also put actual roller bearings in the USA cars.