【答案解析】Dear Sir/Madam,
As a regular passenger of your train, I am completely disappointed to find that the service you provide is far from satisfactory. Therefore, I am writing this letter to draw your attention.
As we all know, punctuality is essential to the railway service. However, the train is delayed from time to time, which brings me much trouble and inconvenience. Worst of all is the bad manners of your stewards and stewardesses. From their services, we can not understand the saying "The customer is the God."
I believe you will take this matter into serious consideration, and I would be glad to see improvements in your railway service.