Unexpected Meeting

In the last carriage of a Northern Line train, a man is standing near the door, book in hand and white earphones in his ears. A woman with a distinctive lock of red hair is sitting down nearby and looking at him as if she knows him. A girl walks down the carriage and as the man moves out of her way he sees, from the corner of his eye, the woman watching him. He looks up and recognition blooms on his face. He steps over and they talk about his new baby for a few minutes before the woman gets off at her stop. The man starts reading again before getting off one stop later.