13-04-2018, 12:31 PM
Questions in the exam tend to feed the next part. Possibly, they are after about bits of the train getting "lost" during the transition, integrity failing during or after the transition too. In the DLR case, it seems simple. Transitioning from TCs to ACs, there is an "overlap" to minimise the risk. Someone else may be able to better explain this from a Mod5 point of view.
First thing to do when answering any question is to state your assumptions and leave room to add more.
WSFs are exceptional. Hazards are train parts disappearing from the operator, to the Interlocking or showing but it being interpreted as a fault. There are several collisions where trains have failed to stop short of an obstruction or an obstruction has not been identified by the signaling "system". Those are becoming less likely but not impossible.
Only other real comment is state facts/principles. If not 100% sure, explain that or leave it out.
First thing to do when answering any question is to state your assumptions and leave room to add more.
WSFs are exceptional. Hazards are train parts disappearing from the operator, to the Interlocking or showing but it being interpreted as a fault. There are several collisions where trains have failed to stop short of an obstruction or an obstruction has not been identified by the signaling "system". Those are becoming less likely but not impossible.
Only other real comment is state facts/principles. If not 100% sure, explain that or leave it out.
Le coureur