How will the poor benefit from rich people using trains?

SUNDAY, APRIL 28, 2013

Re: Competing visions on nation's future, Business, April 20.

 

During the debate, former finance minister Korn Chatikavanij from the Democrat Party said the government’s high-speed train project will be too costly and not accessible to all.
To that, Deputy Prime Minister and Finance Minister Kittiratt Na-Ranong replied, “We must look at the integrated picture. Rich people afford the high-speed train and along the way, their spending will benefit the poor”.
Maybe I am too obtuse to 
understand his reasoning. How will the poor benefit from the rich 
luxuriating on high-speed trains – and by how much?
Would Mr Kittiratt please elaborate on this, for the sake of clarity?
Vint Chavala
Lamphun