Bongo tried to encourage Mr. Neil to be patient when he found out that the train was delayed.  There is only one track for the trains going both directions.  That confused Bongo when he thought about it until Mr. Neil told him not to have "a one-track mind".

So Bongo stopped thinking and then he was OK.

Mr. Neil tried not to look cold.  It didn't work very well.

Mr. David calls this the "stunned mullet" look.