this realization of both the imminent peril and the need of
averting it, to Tom's active brain came the germ of an idea that he
determined to put into force, if he lived through this accident, on
each and every electric locomotive that he might in the future build.

This monster, flying faster and faster down the mountain side, was a
menace to everything in its track. There might be almost anything in
the way of rolling stock on the section between Half Way and Hammon at
the foot of the grade. If this thunderbolt of wood and steel collided
with any other train, with the force and weight gathered by its plunge
down the mountain, it would drive through such obstruction like a
projectile from Tom's own big cannon.

Tom realized this fact. He knew that whatever object the Hercules 0001
might strike, that object would be shattered and scattered all about
the right of way. What might happen to the runaway was another matter.
But the inventor believed that the electric locomotive would be less
injured than anything with which it came into collision.

At any rate, thought of the peril to himself and his invention had
secondary consideration in Tom Swift's mind. It was what the monster
which he could not control might do to other rolling stock of the H. &
P. A. that rasped the young fellow's mind.

The grade above Half Way had few curves. Tom soon caught the first
glimpse of the station. Would the operator hear the roar of the
descending runaway and understand what had happened?

He leaned far out from the open doorway and waved his cap madly. He
began to shout a warning, although he saw not a soul about the station
and knew very well that his voice was completely drowned by the voice
of the siren and the drumming of the great wheels.

Suddenly the tousled head of the operator popped out of his window. He
saw the coming locomotive, the drivers smoking!

To be a good railroad man one has to have his wits about him. To be a
good operator at a backwoods station one has to have two sets of
wits--one set to tell what to do in an emergency, the other to listen
and apprehend the voice of the sounder.

This Half Way man was good. He knew better than to try the telegraph
instrument. He grabbed the telephone receiver and jiggled the hook up
and down on the standard while the Hercules 0001 roared past the
station.

It did not need Tom's frantically waving cap to warn him what had
happened. And he remembered clearly the fact of