Wow, are you really going with two surfboards? Have you already thought about how you will travel with them on the train? :) Of course, in this case, a regular taxi will not work for you and it is better to order a separate minivan for this. I ordered a transfer from
Goa airport to Madgaon on the GetTransfer website and here you can immediately choose the class of the car to be sure that everyone will fit with their luggage. And where exactly are you planning to go by train? I went to Old Goa near Madgaon, where there is a very beautiful old church, which is included in the UNESCO heritage. I also really liked Colva Beach and Braganza House, if you have time and opportunity, then go there!