The old man on the train

I was leaving work today...just missing the train, I watched it pull away...but I saw this old man sitting on the train, looking out the window. He was elderly, easily in his 70's, grayish white hair, eyeglasses, but what caught my eye was his right eye was bandaged up, only seeing out of his left eye. But then the neatest thing happened...he smiled at me. With all he had going on, the hustle and flow of the city...for some reason he smiled, and for those few seconds....everything became really simple and peaceful. The strangest thing......