I'm currently subscribing to many various liveries for freight cars. I'd like to know of all types of freight cars so I can search that specific type and subscribe. If anyone has a list that'd be great, If not commenting with your knowledge of any and all types will do.
From this Wikipedia page you can access clickable descriptions and images of a large variety of rail cars and equipment. List of railway vehicles - Wikipedia
According to steam, here are all the names. Some are duplicates as I just listed everything as I went through each dlc. US: Autorack, tank car, boxcar, maxi stack IV, bulkhead flat car, 2 bay hopper aggregate hopper, centerbeam flatcar, 3 bay covered hopper, bilevel autorack, DOT-117 Tank, 73ft Centerbeam, open top hoppers, 70t & 100t coal hoppers, box & refrigerated cars, open top mill gondola, TOFC flatcar, Coal hopper, ballast hopper, doublestack container, 60' boxcar, reefer car, bethgon II hopper, gunderson husky stack freight car, 3 bay hopper UK: 16t mineral, 5 plank, conflat & standard van wagons, mfa wagons, jna wagons, BR 100T TEA Bogie Tank Wagon, 12T van wagon, HEA domestic wagon, industrial coke hopper wagon, BBA 50ft bogie steel carrier wagon, PCA cement tank wagon, PGA hopper, YCV turbot, YGB Seacow Germany: Kijls, Habbins, Laaers, Sggmrss, Shimmns-TTU, Shimmns-U, Roos-t, Zacns Swiss (only arosa line): SP-W timber wagon