The scene occurred last month in Ohio, in the United States.
The father of a family has deposited her baby on the train and then came out a few moments to smoking.
Unfortunately, the train departed earlier than expected. A passenger tried in vain to alert the father, and to reopen the doors.
Then, we see the father waving to warn the driver. In the train, a passenger has finished by alerting the driver who has turned back to allow this dad to find her child.
All is well that ends well. However, the driver was called to order for not having complied with the usual procedures.