Waving goodbye to a friend

Standing at the platform waving goodbye
Forcing a smile, I dont want to cry
You've been such a good friend
I'm sure you'll be there til the end
The smile on your face is forced too
Because that is how I will remember you
Standing at the platform waving goodbye
You promise to write, well you'll try
A whistle blows the train starts to go
We'll miss each other that I know
The train moves off, then out of sight
I wait for your letter I hope you'll write