To eliminate any possibility of the trolley wire breaking, a
strong steel cable, called a catenary, was slung just above the
trolley wire. To this catenary the trolley wire was suspended by
hangers at short intervals.

These cables were strung from brackets so that a single row of
poles could be used, save at the curves, at which cross-span
construction was used. The trolley wire itself was of the 4/0
size, and was the largest diameter copper wire ever employed for
railroad purposes.

Several weeks had now passed since the great locomotive had
been assembled in the erection shed and the cab of the locomotive
completed. It really was a monster machine, and any stranger
coming into the place and seeing it for the first time must have
marveled at the grim power suggested by the mere bulk of the
structure.

When the day of the first test arrived Tom allowed only his
most intimate friends to be present. Mary Nestor accompanied Mr.
Swift into the shops at the time appointed, and she was as
excited over the outcome of the test as Tom himself.

Ned Newton and the mechanical force of the
shops knocked off work to become spectators at the exhibition.
The only other outsider was Mr. Damon.

"Bless my alternating current!" cried the eccentric gentleman.
"I would not miss this for the world. If you tried to shut me