As an old railroad tradition, when an engineer was retiring, his coworkers would put one torpedo for each of his years of service on the rails as he pulled in from his last run, giving him kind of a 21 gun salute as he arrived at his final stop.
Connecticut Valley Railroad -- A Branch of the New York, New Haven, And Hartford
"We don't stop playing because we grow old. We grow old because we stop playing." --George Bernard Shaw