Someone beginning to read your letter would redirect it internally to the Complaints Department, where it might well sit for a while. It is only way down that we read you also happen to want a refund of monies!
Sorry, but I would suggest that you redraft the letter, stating that you are requesting compensation for the extra cost of your journey, and the grounds for your request (the lateness of the train).
Then, you could write a separate letter of complaint if you feel really strongly about it; or in the first letter, after you have have made your request and given your grounds, then let fly and complain!
Student or Learner