I am being a realist, there are terrorist attacks almost daily in some ME countries and Pakistan. A train packed with tourists and businesspeople is pretty much the same target value to a terrorist as a plane, except you can attack it from the outside much more easily. The prevalence of IEDs and people willing to use them, highly mobile suicide car bombs and the doctrine of certain radical Muslims which allows for moral permissibility of killing fellow Muslims who are "dealing with the enemy" (strains of Wahhabi and Qutbism thinking like Bin Laden's) would make such an attack inevitable.
This "negative" attitude of mine is part of the economic damage that is done to the moderate Muslims of these countries by the extremists. How many tourists have decided not to take a trip to many of these countries? How many businesses haven't been set up? How many skilled workers have fled? It's a massive economic damage these people are inflicting beyond the scope of their deplorable murders.