FRA Signal Systems & Train Control 3

Question 1

What is the function of the 'vital' logic in a solid-state interlocking (SSI) system?

Accepted Answer

To ensure fail-safe operation so any failure defaults to a safe state

Answer

Vital logic in solid-state interlockings is designed so that any component failure causes the system to default to the most restrictive, safe state.

Question 2

What does a 'time release' in interlocking logic accomplish?

Accepted Answer

It delays signal changes to allow train movements to clear conflicting routes

Answer

Time releases delay the clearing of conflicting routes or signals until sufficient time has passed for a train to have cleared the interlocking.

Question 3

According to FRA rules, what defines 'restricted speed' in signal territory?

Accepted Answer

A speed not exceeding 20 mph, prepared to stop within the range of vision

Answer

Restricted speed is defined as a speed not exceeding 20 mph while prepared to stop within the range of vision, short of a train, obstruction, or misaligned switch.

Question 4

Which FRA-regulated system uses transponders embedded in the track to provide location and authority information directly to the locomotive?

Accepted Answer

Communication-Based Train Control (CBTC)

Answer

CBTC systems use trackside transponders (balises) to provide precise location data and movement authorities to equipped locomotives.

Question 5

What is the maximum civil penalty per violation per day under 49 CFR for failing to maintain required signal system records?

Accepted Answer

$25,000

Answer

FRA may assess civil penalties up to $25,000 per violation per day for violations of signal and train control regulations under 49 CFR Part 236.

(FRA) Federal Railroad Administration Certification Practice Test

(FRA) Federal Railroad Administration Certification Practice Test

FRA Signal Systems & Train Control 3