OK: based in roller-coaster loving DS and what's been on the news today:
Most roller coasters have only one car at a time. Some longer ones have one car per section. Smiler was one of them. There should be no way at all that a car should be able to enter a section where there was another car. Even if investigators have some idea how come two were on the same section, nothing has been made public yet.
Of the other closed rides, Saw is a similar ride to Smiler and was made by the same German firm. Dragonsfury and Rattlesnake aren't that similar, but are in sections.
HSE have put a prohibition notice on Smiler, so that simply cannot open. But there's no reason why other parts of AT could not reopen, other than the management thinks it wrong. Being closed in sunny June in the post exam period and including weekends is a very expensive decision for them. But I think it's the right thing to do, certainly until all on-site investigations are completed (they're removing sections for specialist examination).
Not sure what's happening at their other sites. They appear to be saying that no failings or problems have been identified with them, but they are performing extra checks in everything.
Anyone know if non-Merlin sites are having similar reviews?