Both trains and buses have their advantages and disadvantages.
A combination of both is the best option.
Neither one nor other is a stand alone solution.
Whichever way you look at it it is costly and, yet again, shows the absolute stupidity of an out of control population growth.
Singapore has the best system I have yet encountered with both systems.

Infrastructure vision is gradually becoming a thing of the past as the quick Buck mentality will not allow it !

I would have thought that getting traffic of very congested roads to railways was a good idea, and less dangerous.