As for railways, service was reestablished two days ago. Everything works by now.
There is no place in which you should be super-careful. Terrorists attack always wherever and whenever they can, usually in the less expected place and time. Whatever you do (cancel your trip, coming here, going to certain places or not) you will always have a minimum risk. Even if you don't get out of your home. Therefore, why let it affect your life?
Come and enjoy!
Fernando