EVERYTHING THAT I CAN THINK OF TO IMPROVE SAFETY.
1. Reduce the chances of a stall - This could be done by raising the high points to increase the speed, but would never get planning permission. Alternatively they could add weight to the trains or install a mini launch prior to the batwing. In my view the most likely method is to change the wheel compounds and clearances. It is clear that wind monitoring equipment has been installed, and I believe that The Smiler will not operate when the windspeed and direction increase the likelihood of a stall. I believe that empty cars will no longer be sent round during opening times and that a new kind of weighted dummy may be designed over the closed season that is quicker and easier to embark / disembark.
2.Ensure that two trains can never occupy the same block. I think the Smiler did the job it was supposed to do on the day of the incident and that this system is allready very safe... BUT... it is clear that processes that allowed staff to overide the safety system were not robust enough. Solutions include better staff training and supervision, multiple reset panels around the ride that will work only when used in conjuction with each other, improved communication from around the ride to the cabin and the installation of more cameras. I think they will do all of these things.
3. Better protection in the event of a collision. I believe that crumple zones, airbags, etc would be impractical to retrofit and that the train design will remain unchanged with the budget going into ensuring the block seperation. I do believe however that improved rider protection will be built into future coasters, including SW8 in particular.
4. Track stability. It cannot be guaranteed that a rollercoaster will never shed a bolt. Even the superbly engineered and built B and M's have been known to do this. It is concerning that when The Smiler shed a bolt in its first year of operation there was a degree of track seperation. It is also notable that Gerstlauer have used more but smaller bolts on later infinity coaster models. I assume this is to add a greater redundancy against track seperation. It would clearly not be possible to retrofit new bolt designs to The Smiler. The loss of a bolt or anything falling off The Smiler in the future would be a PR disaster as the press would be merciless and I'm sure Merlin know this. I suspect that The Smiler will become a more expensive ride to operate as track and bolt inspections will be both more thorough and more regular.
With all of the above send, I know that rollercoasters are statistically incredibly safe and I will happily get corrected when it reopens