(Each question of-this kind consists of a series of statements related to a stem that precedes
them. Indicate which are true and which false with respect to the stem,)
A frog is installed in a turnout so that a train's wheels and wheel flanges can cross the rails.
It is true of a frog that:
a. While the wing rail of a spring frog is being held open by spring tension, the train can
follow the alternate path through the frog.
b. The bolted-rigid type may be made from standard rail.
c. When a train passes over its actual point, the wheel is unsupported.
d. Its theoretical and actual points are between its heel and throat.
e. A train never reaches it when a trailing-point move is made.
Concerning switch-throwing arrangements, it is true that:
a. Yard turnouts are controlled by electric switches located in the yardmaster's office.
b. A manually operated switch stand may be kept locked to keep anyone from throwing it
c. An electrical switch-control system is operated by remote control.
d. A manually operated switch stand includes a target to show which way the switch is
e. Split switches are unequipped with throwing mechanisms.
In choosing where to locate a turnout, you would determine the:
a. Speed at which trains should be able to pass through it.