Maybe, I am too influenced on the CSO in NEL / CCL and everytime
see the staff take a walkie talkie hearing things in tunnel (I noe
TO cabin no walkie talkie), and hence, I think SMRT should have
stated this hearing requirement clearly and stating the reasons of
such, in order to have potential candidates not to shattered their
dreams at the last moment.
This, and also because you have to have a good sense of hearing to
diagnose if the train has faults. It is crucial for safe operation
of the trainset.
On a rainy day, you must use your sense of hearing as well as
feel, to know if the train is losing traction on braking or
accelerating - the sound made is a rough vibrating noise.