My first train trip was at 2 1/2 and it started a love affair (I actually remember the trip).
As a child, my grandma took me on a few train trips. Loved them. When I was five, my grandpa came to get me in Indiana and took me to Virginia on the train. That was a disaster.
As a teenager, I traveled over 9000 miles in 3 months, all over Europe on a Eurail pass with my 14-year-old sister. The love affair continued.
As an adult, I've only taken four train trips but I'd dearly love to take the long one across Canada.