the problem is to build a machine that will transmit power enough
to draw the enormous weight of a loaded freight train, and that
over steep grades.

"A motor for each car is a costly matter. That is why trolley
car companies, no matter how many passengers their cars carry,
are so often on the verge of financial disaster. The margin of
profit is too narrow.

"But if you can get a locomotive built that will drag a hundred
cars! Ah! how does that sound?" demanded Tom. "See the
difference?"

"Bless my volts and amperes!" exclaimed Mr. Damon. "I should
say I do! Why, Tom, you make the problem as plain as plain can
be."

"In theory," supplemented Ned Newton, although he meant to
suggest no doubt of his chum's ability to solve almost any
problem.

"You've hit it," said Tom promptly. "I only have a theory so
far regarding such a locomotive. But to the inventor the theory
always must come first. You understand that, Ned?"

"I not only appreciate that fact," said his chum warmly; "but I
believe that you are the fellow to show something definite along
the line of an improved electric locomotive. But, whether you can
reach the high mark set by the president of that railroad--"