Then a new look came over his face, which I wondered at.

It was soon explained.
The transfer point was also a division point for this car.

The motorman and conductor were changed, and the moment the new crew came, our motorman jumped from his own car, ran to the one the brunette had taken, and swung himself on, as it crossed at right angles over the track we were to take.

Rising to his feet the youth watched the passing car, with keenest interest until it was out of sight, clearly revealing the jealousy, worry, and unrest he felt.
In another chapter I have dealt more fully with the subject of the worries of jealousy.

They are demons of unrest and distress, destroying the very vitals with their incessant gnawing.
Too great emphasis cannot be placed upon the physical ills that come from worry.