This story is literally coming up for a hundred years old and I've no idea if the stranger in question ever told his family about it but it's handed down through the generations in mine and I like to think it will last for many generations more.
1918 - my grandfather was being invalided home from Egypt. My grandmother had been notified and went to meet him at the train station. So many men streamed past her and she was surrounded by heartfelt reunions.
The platform was practically clear and she couldn't see my grandfather. She'd been out to the concourse and back, searching everywhere but no sign of him. She was panicking, wondering if he'd missed the train, if something had intervened.
His bright red hair was so distinctive and his build so strong and strapping it just wasn't feasible she'd not seen him no matter how many troops there were.
She noticed what a balding, stooped, yellow, shuffling, skeleton, pulling himself along the side of the train, hand over hand. She was worried about him and just going to find a guard to assist him when the platform started hurtling towards her and was only prevented by a passing business man who caught her in her near-faint.
He said, "You're unwell. Can I assist you?"
GM: "I think that man is my husband."
Sizing the situation up, the business man helped her behind one of the pillars, supported her and blocked her from view.
"He mustn't see you like this. You rest here. And when you're ready, go to him with as joyful and open a heart as you can muster."
More conversation that she couldn't recall. Then she went to my grandfather. The businessman had somehow organised the Station Master and others to help them into a transport that he pre-paid to take them home.
A hundred years on - and that act of kindness is still remembered.