question attempt- 2012-Q3 - Printable Version +- IRSE Exam Forum (https://irse.signalpost.org) +-- Forum: MODULES (https://irse.signalpost.org/forumdisplay.php?fid=3) +--- Forum: Module 5 (https://irse.signalpost.org/forumdisplay.php?fid=8) +---- Forum: Train Detection (https://irse.signalpost.org/forumdisplay.php?fid=63) +---- Thread: question attempt- 2012-Q3 (/showthread.php?tid=2310)

question attempt- 2012-Q3 - tfly86 - 03-09-2018 Hi all, please see my attempt from the 2012 Mod 5 paper. this is question 3 on the paper which reads as follows: Question 3 (2012) Describe with the aid of diagrams the operation of the following two systems: Joint less track circuit axle counter system [15 marks] What are the advantages and disadvantages of each system? [10 marks] Please can you provide comment. Regards Tommy RE: question attempt- 2012-Q3 - Jerry1237 - 04-09-2018 A few comments. TCs should not be relied upon to detect broken rails and it should not be used as a pro or con for anything. It would appear there is some mixing of terminology and understanding for the EBI section. From memory, the Tx sends a frequency out that the Rx interprets and if the Rx is receiving the correct frequency, the track is clear. A train shorts the track and stops the Rx seeing the frequency and hence goes occupied. Voltage/current applies to other non-audio track types where shunting would drop a track relay. Answer is heading in the right direction and the format is good.