with passengers cars. They are run on their own schedule and sometimes
attached to freight cars.

This immense Tube Line was built by the government at great expense, but
it is proving very satisfactory. No storms or floods interfere. No
grade-crossings and no flying dust are known in this Tube Line which has
brought the ends of Ploid together. Think of a person crossing a vast
continent in a day, for the cars in this Tube Line run with frightful
speed across the long stretches of level. They make as high as a
three-hundred mile run in forty minutes, without stopping.

The signal and telegraph stations are fifty miles apart, sometimes more.
In these long runs the motorman stops only when a signal is turned
against him or if by accident he discerns a train in the Tube ahead of
him.

The Tube Line is lighted by oval transparencies, in size and shape
resembling an egg, soldered in specially prepared holes of the Tube.
The cars are not supplied with air from the tube. Fresh air is obtained
from the evaporation of a semi-solid.

On the top of this Tube Line there is a double railroad used for local
travel, both passenger and freight.


THEIR STORAGE BATTERIES.

Compared with our world, the fuel of Ploid is very scarce, but less is
required to supply the industries. Nearly all power is obtained from the
winds, running water and the sun's energy.