The children in the front row have been crying for 15 minutes since they got on the high-speed train.

Starting with high-speed rail
The children in the front row were crying all the time.
The child stopped crying when the train went on for 15 minutes.
Her mother began to use her cell phone to let out the baby’s crying.
"Listen to who’s crying?"
Then "Wow…"
The child lived up to expectations and cried again.