My wife and I will be spending 3 weeks in Europe doing the most touristy things possible.  I am trying to find the most economical route to get to each city.  I've found prices for air travel but train ticket prices are not so easy.  Some sites say they don't have prices up until 90 days before the travel date.  Also, how much time and/or money would I save taking the train?  Here are some details:

* 
Our destinations are Barcelona, Dublin, London, Amsterdam, Rome, Venice, and Paris.
* The route is so far undecided however we are leaning towards starting in Paris and ending in Dublin because flights from/to the US is cheapest.
* Our journey starts in July (hooray peak season!)
* We understand 3 weeks won't be enough to fully appreciate the cities and culture.
* Luggage will be 32L backpacks and less than 22 lbs each.
* Both of us are under 25 but not students. 
* So far, the price to beat is $431 total for flights.
user
Is air travel really cheaper than train ticket? What is the best way to get from one city to another? What do we have to bring in a plane?
assistant
My wife and I will be spending 3 weeks in Europe doing the most touristy things possible.  I am trying to find the most economical route to get to each city.  I've found prices for air travel but train ticket prices are not so easy.  Some sites say they don't have prices up until 90 days before the travel date.  Also, how much time and/or money would I save taking the train?  Here are some details:

* 
Our destinations are Barcelona, Dublin, London, Amsterdam, Rome, Venice, and Paris.
* The route is so far undecided however we are leaning towards starting in Paris and ending in Dublin because flights from/to the US is cheapest.
* Our journey starts in July (hooray peak season!)
* We understand 3 weeks won't be enough to fully appreciate the cities and culture.
* Luggage will be 32L backpacks and less than 22 lbs each.
* Both of us are under 25 but not students. 
* So far, the price to beat is $431 total for flights.
user
How much time and money does a train ticket to Europe cost? How many days would it take to fully experience each city and culture? Edit: For reference, my wife and I are both under 25. We purchased our ticket together and we have
assistant