28-08-2011, 06:06 PM
(This post was last modified: 10-12-2017, 04:48 PM by PJW.
Edit Reason: replacing missing WORD by pdf
)
A railway administration is considering the introduction of a moving block signalling system onto their high-capacity two-track suburban railway, which currently has a fixed block signalling system with colour light signals.
The train service will be in excess of 24 trains per hour in each direction and the line features a number of intermediate stations.
Describe the main features of a moving block signalling system. Include in your description details of the advantages and disadvantages of a moving block system when compared to a conventional fixed block system. [15 marks]
What are the problems faced when implementing a transmission based signalling system on an existing trackside signal based infrastructure and how can these be overcome? [5 marks]
I was sent privately an attempt at this question; it did strike me as one I would not have expected this person to have attempted from what I know of their experience. However it did display some relevant knowledge on the subject and also made a clear attempt to answer the question, but I didn't feel that it had succeeded very well.
I felt I needed to explain what I'd have thought it should have included, but to do this I needed to effectively do it myself. Therefore I made an attempt (not time constrained other than I have a 101 things to do and didn't want to waste ages on it). Having done so I thought I might as well post here; it is probably some 50% more than you could expect to write in examination conditions.
The train service will be in excess of 24 trains per hour in each direction and the line features a number of intermediate stations.
Describe the main features of a moving block signalling system. Include in your description details of the advantages and disadvantages of a moving block system when compared to a conventional fixed block system. [15 marks]
What are the problems faced when implementing a transmission based signalling system on an existing trackside signal based infrastructure and how can these be overcome? [5 marks]
I was sent privately an attempt at this question; it did strike me as one I would not have expected this person to have attempted from what I know of their experience. However it did display some relevant knowledge on the subject and also made a clear attempt to answer the question, but I didn't feel that it had succeeded very well.
I felt I needed to explain what I'd have thought it should have included, but to do this I needed to effectively do it myself. Therefore I made an attempt (not time constrained other than I have a 101 things to do and didn't want to waste ages on it). Having done so I thought I might as well post here; it is probably some 50% more than you could expect to write in examination conditions.
PJW
