Trains and Tracks

This just came to mind in the morning. It is something somebody asked a long time ago and I still think it is meaningful.

There were 2 railway tracks running parallel to each other. One was an old track that was no longer in use, but there is still an intersection linking the 2 tracks together; remnant of the time when the new track was constructed and time was needed to migrate all train routes to the new track. A sign had been put up to warn people not to trespass on the new track.

One day, a group of children decided to play on the railway tracks. One of the boys saw the sign and informed the others, but all they did was to laugh it off and continued playing on the new track. A lone boy decided it was safer playing on the lone track and decided to play there by himself.

Half an hour later, a train traveling at full speed appeared. The train driver did not spot the children playing on the new track until it was too late to brake the train. If you are the train driver, what would you do? Would you run down the group playing on the new track or the lone boy playing on the old track (assuming you can switch the link and go onto the old track)?

There is no right or wrong answer.