Railway Systems Engineering

A: Option A would undercook the load and would pass a track class check that later fails once occupancy is added, which is a classic early-phase mistake. Option B ignores the carbody contribution and would lead to optimistic rail stress and sleeper reaction estimates. Option C mixes up axles and bogies and would immediately overshoot typical passenger line limits. Option D follows first principles mass distribution and gives the right order of magnitude before dynamic and load factor additions.

A: Option A would reduce the hazard log to paperwork and misses the safety engineering intent. Option B would actually increase lifecycle cost and contradict how RAMS supports design iteration. Option C confuses EN 50126 system safety with EN 50129 signalling assurance. Option D aligns with functional safety logic by driving hazard elimination before design choices become frozen.

A: Option A would imply a load path that the mounting brackets cannot physically support. Option B ignores that GA symbols carry functional intent used by stress and dynamics teams. Option C mixes up rotational axes and would not address hunting stability. Option D matches the inconsistency between symbol orientation and intended yaw control function.

A: Option A would affect multiple axles along the route rather than a single one. Option B would change load sharing but does not directly drive flange contact noise. Option C could add noise but would not selectively wear one flange. Option D forces continuous flange contact in curves, driving both squeal and accelerated localized wear.