I want to know the answer to the following question:
Why overhead wires are not being widely used?
All the background I'm provided with is that "Disadvantages of electric traction include high capital costs that may be uneconomic on lightly trafficked routes; a relative lack of flexibility since electric trains need electrified tracks or onboard supercapacitors and charging infrastructure at stations; and a vulnerability to power interruptions.". Is that enough to answer the question?