In message .com,
Peter Vos writes

If it was actually intended, then scheduling becomes more relevant
because you have to pick two trains that will simultaneously hit the
junctions. Hard to believe it was simple dumb luck.

The bombs were almost certainly detonated manually. The police have said
that no timing devices have been found in the remains.

If you have that kind of planning and since they are now saying one
bomber per train, I wonder why they didn't hop off at Edgware Road and
Liverpool Street while leaving the packages behind.

Dying for "the cause" was an important part of the entire mission.

--
Paul Terry