25-03-2015, 07:20 PM
Both tracks and ACs are a problem for relaying. Think about how they are attached to rails, the importance of their location, IRJs etc, and the competance for bringing them back into service. The railway is being made more tamper friendly generally. However, engineering management would ensure any works had suitably competent people available in the right numbers to recommission signalling equipment.
The point about rolling stock isn't totally correct. The conductivity of wheelsets is given (prescribed by standards). There are issues on rail head and wheel contamination which causes issues with tracks. This can be magnified by low axle loadings and/or environmental conditions.
The format was understandable. Remember, the point is to confirm to the examiner you understand the underlying principles. To a degree, style is moot.
I'll leave the technical responses to those more clever than I.
Jerry
The point about rolling stock isn't totally correct. The conductivity of wheelsets is given (prescribed by standards). There are issues on rail head and wheel contamination which causes issues with tracks. This can be magnified by low axle loadings and/or environmental conditions.
The format was understandable. Remember, the point is to confirm to the examiner you understand the underlying principles. To a degree, style is moot.
I'll leave the technical responses to those more clever than I.
Jerry
Le coureur