Three more missions completed this evening, including an irritating one where I had to kill two bosses (one of which was the train again), and then escape from the complex in five minutes. It would have been easy, except that there were loads of baddies in the way, and if you die you have to start the whole escape run again (rather than just the room again, like you would normally). Managed it eventually.
There was another repeat boss later too. And I’ve seen loads of recycled room layouts as well. Lazy…