Maintenance

Question 1

5 tasks in a D84M Clawlock SS01

Answer 1

Examine for obstructions
Lubricate points claw lock equipment
Lubricate Rail chair seats
Operate points and check for correct operation
Test Lock
Test Detection

Question 2

5 tasks in a JAH Trainstop SS01

Answer 2

Check for any damage
Check mounting
Check any fixings and fasteners
Check for damage to trip arm
Check operation of motor
Check operation of safety latch and motor ram
Check hydraulic fluid level
Check circuit controller operation and adjustment
Check return spring
Lubricate trip arm
Paint trip arm

Question 3

5 tasks in a TI21 SS01

Answer 3

Check polarity
Check bonding
Check condition of rail
Check/clean Tuning units
Examine Power supplies
Check ballast condition
Check arrestor/lightning protection
Conduct track inspection
Measure receiver/relay readings

Question 4

5 tasks in a type F Level Crossing SS01

Answer 4

Put Cerberus into maintenance mode
Check Lights
Check Bells/Siren from 30m
Check Battery condition and charge
Check operation load current
Check Battery Charger
Check signage
Check Boom
Check Gates if applicable
Check switch boxes
Check mechanism

Question 5

5 tasks in a SSI SS01

Answer 5

Check faults on technicians terminal
Test link A and B for 3 mins
Check Logger operation
Check file sizes are correct
Check log file information is correct

Question 6

5 tasks in a Microlok SS01

Answer 6

Download and review error log
Download and review event log
Check VCOR condition
Check battery condition
Check battery charger

Question 7

What is done in preparation prior to starting the work

Answer 7

Notifying the Signaller of the intended works, during and location.

Question 8

What are the three actions in a TMP

Answer 8

Preparation, Maintenance, Reinstatement

Question 9

Are Signal electricians responsible for signal mechanics

Answer 9

They must ensure that mechanical employees are carrying out maintenance properly

Question 10

What must Signalling staff ensure when leaving after working on equipment with doors, lids or covers

Answer 10

They are effectively locked

Question 11

What is a safety critical task

Answer 11

A task which protects against wrong side failures in safety related asset or equipment. Failure of such equipment has a high probability of causing and incident with sever consequences

Question 12

What is a safety significant task

Answer 12

A task which protects against a wrong side failure in a safety related asset or equipment. A failure of such equipment has a medium to low probability o causing an incident with sever consequences

Question 13

What are 3 examples of safety critical tasks

Answer 13

Points lock and detection, AC double rail Maintenance, inspection of non-proved relays

Question 14

What are 3 examples of safety significant tasks

Answer 14

Inspection of level crossing protection, Insulation resistance testing, parallel bond inspection

Question 15

Typical events that require trainstop gauging

Answer 15

Rerail next to trainstop
Replacement of trip arm
After trainstop was removed
when the trainstop is in question
Renewal of trainstop

Question 16

How do you perform a Battery load test on microlok

Answer 16

Call and notify signaller
Place meter on battery on DC Volts
Set meter to min max
Turn of battery Charger for 5 mins
Ensure voltage doesn’t drop below 12V
Reinstate and notify signaller

Question 17

What is a transposition bond and why is it used

Answer 17

It is a bond that changes one traction rail to another. It is used in turnouts where the traction rail needs to be alternated to not short circuit the track.

Question 18

What is Transmitter modulation failure and how do you test it

Answer 18

Where the output frequency of the transmitter is outside the permissible specifications.
Tested with a DMM on frequency min max. +/- 2 is okay. +/- 10 is condemn.

Question 19

What are 3 tests for a suspected tuning unit

Answer 19

Visual Inspection
Attenuation test
Short circuit test
Impedance test

Question 20

Reliability vs Safety for points detection

Answer 20

Heavy detection is unsafe
Light detection is unreliable

Question 21

Reliability vs Safety for Drop shunts

Answer 21

Low drop shunt is unsafe
High drop shunt is unreliable

Question 22

What is DPU and what is it’s purpose

Answer 22

Data-Pick Up unit
it is used for precise pin point detection of train locations in a track circuit.

Question 23

What is the length of a tuned loop

Answer 23

CSEE 19m without SI, 23m with SI
TI21, FS2500 20m

Question 24

What is a drop shunt

Answer 24

It is the maximum resistance that when applied across the rails of a track circuit at the relay/receiver end will cause the track relay to de-energise.

Question 25

What is a fixed shunt check

Answer 25

When a pre-defined resistance is applied to the track circuit at the relay end to check the relay de-energises

Question 26

What is a fixed shunt test

Answer 26

When a per-defined resistance is applied to the track circuit at all extremities and mid-point to check the relay de-energises

Question 27

What is a train shunt check

Answer 27

A test conducted by monitoring the receiver end voltages while a train traverses over the full length of the track circuit

Question 28

What is a Zero feed test

Answer 28

It is a test completed by removing power to the supply for a track circuit and measuring input at the receiver/relay. It checks for potential false energisation from an adjacent track circuit.

Question 29

What are the 6 steps when investigating a failure

Answer 29

Analysis Identification Problem definition Test plan Solution Certification

Question 30

What is the purpose of an SI unit

Answer 30

To help balance the DC traction potential and stabilise the inductance in a tuned loop

Question 31

When are like polarities acceptable

Answer 31

When it is a track Feed to Feed interface arrangement. When a short circuited Insulated joint will cause both tracks to fail.

Question 32

Can incorrect polarities be fixed if found when conducting maintenance.

Answer 32

No, you must always notify the signal engineer

Question 33

What is KrV

Answer 33

It is the track receiver input transformer ratio and adjusts receiver sensitivity.

Question 34

What are the three bonding arrangements for turnouts

Answer 34

Series Series Parallel Parallel

Question 35

What should flangeway clearances be

Answer 35

60mm +/- 5mm

Question 36

What are the 3 actions in a TMP

Answer 36

Preparation Maintenance Reinstatement

Question 37

How do you disconnect an A/C Track circuit

Answer 37

Fuse to the primary of the feed One of the outgoing links on the secondary Relay fuse

Question 38

What is considered a minor adjustment to a track circuit

Answer 38

10%

Question 39

CSEE track circuit voltages

Answer 39

PSU 120VAC Tx 24VDC supply Tx 45-60V AC output Tx TMU 2-5V AC Rx TMU 0.2-1.5V AC RX input 350mV Rx 24VDC supply Relay 24V DC

Question 40

When is a reset of the ET200 threshold required

Answer 40

Track is certified Receiver replaced Frequency key changed Adjusting a sagging track Advice from maintenance engineer

Question 41

Level Crossing float and alarm voltages

Answer 41

10 Cell 14.5-12.2 12 Cell 17.5-14.6

Question 42

Prior to lock and detection testing what are checks that need to be completed

Answer 42

Switch plates clean and lubricated switch plates checked for even loading No excessive movement affecting track gauge No rail defect on the switch and stock. Point lock and detection drive components in good condition and will perform the intended function Backdrive has corrrect operation

Question 43

What are documents required to be submitted after points maintenance

Answer 43

Points history card Montly returns for maintenance