Flossie, who were now having a very nice ride and a very good time indeed
on the elevated express train.

By this time the ticket chopper, the agent who sold tickets, the station
porter and several persons who were waiting to take a train, had heard
from Nan and Bert what had happened. These people offered all sorts of
advice, but Mr. Bobbsey thought it best to listen to that of the ticket
agent, who, of course, would know more about the elevated trains than
persons who only rode on them two or three times a day.

The ticket chopper had seen the children rush by him and on to the train,
but they had gone by so quickly that he had not been able to stop them,
and, as there were a good many people on the platform, he did not know to
whom they belonged. So he told the ticket seller and Mr. Bobbsey that
Flossie and Freddie had taken the last express train that had passed the
station.

"It would have been easy enough to stop them if you'd only known it at
first," said the ticket seller; "but they've got the start of you now, and
after Sixty-sixth Street these express trains make only a few stops before
they reach the end of the line. But I can telephone to one of the ticket
sellers at one of the uptown stations and have him meet the train and take
the children off."

"What will he do with them?" asked Mrs. Bobbsey.

"Oh, he'll keep 'em safe till you folks get there. The trains run pretty
close together at this hour of the day. Your husband can get uptown after
'em so quick that they won't have to wait long."