Every day, the small girl waved to the trains that passed by her house.

Every day, the small girl waved to the trains that passed by her house: Three years later, the railway drivers observed a sign at the small girl’s window and knew they had to act quickly.

The phrase “you never know how deeply you care about someone until you lose them” is as true as it gets and may be applicable in a variety of situations. For some locomotive mechanics in Tulsa, Oklahoma, that someone was a little girl named Rio, who waved her hand every day from a window next to the railroad lines.