Can’t create a custom formation using these 100T Tea tankers I can add 1 tanker but nothing else. I can’t even use the copy button to add more tankers. Another issue is the dot 117 tankers after creating a custom formation they don’t spawn in free roam only the locomotive I’ve tried using a 66 and a GP-38 locomotives spawn but not the tankers. This also occasionally crashes the game
Don't know if you're interested but you can use the freeware NTP TEA tankers in formation manager so long as you use the empty version. You can also apply Creative Centre liveries to these tankers if you wish.