I got an Xbox Series S for Christmas, but only just checked out the next gen features on BML. I realised no SE trains arrived after spawning at Victoria in the afternoon. I don't think this has been bought but before so mabye there is something wrong I did?
There seems to be currently an issue of no southeastern AI spawning if you entered the route especially the first time after booting up the game try quitting back to the menu and go back in afterwards I’ve had the issue where I spawned and there was none at Victoria I quit then came back at the same time and 3 turned up (2 465 and a 375 were their parked in platforms at Victoria)
you can also spawn at Battersea Park or Clapham Junction to get an AI train to Victoria. SE trains will usually spawn if you do that as well.