PR S 40026

Question 1

Give some examples when signalling personnel are required to attend a planned rerail

Answer 1

when it affects the interlocking, in track circuited areas, outside sub-stations and section huts, where a level crossing is impacted.

Question 2

Can civil representatives apply temporary bonds

Answer 2

yes if authorised by a maintenance signal engineer. they must be properly instructed and competent.

Question 3

what are the three important steps in the protection for a rerail

Answer 3

protecting signals booked out, track circuits booked out and alternative traction arrangements in place

Question 4

what is required before affecting traction return

Answer 4

adequate alternative traction current paths are available

Question 5

3 ways to clean rail head of contamination

Answer 5

mechanised rail grinder,
hand profile grinder,
usage of tabled trains or rolling stock.

Question 6

what is the check required for a newly installed section of rail

Answer 6

a train shunt check

Question 7

what are the 3 exemptions to a train shunt check

Answer 7

1. Rail is less than 15m long, more than 15m away from block joint or tuned loop.
   fixed shunt check
2. Rail is less than 15m long, within 15m of a tuned loop or GIJ. This includes a switch and stock of any length.
   hand profile ground along full length, visually inspected. a fixed shunt check
3. More than 15m in length.
   mechanised rail profile grinder, fixed shunt test at all extremities and visually inspected. must be completed within 72 hours of certification

Question 8

What testing is required before certifying a rerail back into use

Answer 8

Ensure relay operates correctly and observe value, check polarity and correct track connections and bonding, carry out fixed shunt check and measure voltage, carry out train shunt check, carry out zero feed.

Question 9

when do trainstops have to be regauged

Answer 9

any time they are affected, moved, or the trainstop triparm position is in doubt.

Question 10

what is the tolerance for ETCS balises

Answer 10

+/- 350 for ASDO
+/- 600 for ATP

Question 11

lengths of temporary rail bonds

Answer 11

2m or 6m

Question 12

how are temporary rail bonds managed

Answer 12

they are kept on a register

Question 13

who is responsible for the issue of temporary rail bonds

Answer 13

the maintenance signal engineer

Question 14

temporary bonding restrictions for double rail A.C track circuits

Answer 14

bonds can only be placed around the cut and across the 4 foot on both sides of the break.

Question 15

temporary bonding restrictions for electrified areas

Answer 15

only 1 rail can be cut at a time between adjacent substations, and no multiple breaks.