Where my wife lived in A.C. there is also a disused rail line at the end of the road that`s been built over by squatter shacks. I think there was a line that ran from La Union to Bicol years ago so I think a system could work that would cover Luzon down to Matnog for Samar and then onward from there.
I suppose it could happen,unlikely but you never know if oil prices go higher and higher.