Following on from incidents, I cant remember pre or post smiler, they wont run 3 trains anymore, I believe its block related and possible for a minor bump between trains if all 3 end up in station/waiting/ brake run due to a delay.
there was talk of up grading the brake system a while back to prevent the 3rd train meeting the waiting block. However it didnt materialise due to cost/ other reasons.
as such merlin wont risk an incident like that however minor again, resulting in 2 train ops.
there is no longer any rush/effort to load quickly, more slowly and safely