REC Signal Systems & Communication 3

Question 1

What is 'approach locking' in signal system terminology?

Accepted Answer

A lock preventing signal changes while a train approaches and occupies the block

Answer

Approach locking prevents a signal from being cleared or a route from being changed after a train has approached within a specific distance of that signal.

Question 2

Under Centralized Traffic Control (CTC), who has authority to align switches and signals?

Accepted Answer

The train dispatcher at the control center

Answer

In a CTC territory, the train dispatcher remotely controls all switch and signal alignments from a centralized control center.

Question 3

What does the term 'vital' mean when describing a railroad signal circuit?

Accepted Answer

A failure of the circuit results in the most restrictive indication

Answer

A vital circuit is designed so that any component failure causes the system to default to the safest (most restrictive) state.

Question 4

In a cab signaling system, where is the signal indication displayed?

Accepted Answer

On a display in the locomotive cab

Answer

Cab signaling transmits coded current through the rails and displays the appropriate indication directly on instruments inside the locomotive cab.

Question 5

What does a 'Diverging Clear' signal indication permit?

Accepted Answer

Proceed on the diverging route at the maximum speed for that route

Answer

Diverging Clear permits the train to proceed on the diverging route at the maximum authorized speed for that specific diverging route.

(REC) Railroad Engineer Certification Practice Test

(REC) Railroad Engineer Certification Practice Test

REC Signal Systems & Communication 3