The old Manila to Naga (and originally to Legaspi) train only went about 25mph of course, mainly due to the horrendous state of the track, and the fact that standard gauge rolling stock had been adapted to run on narrow gauge track.....about 3ft I'd say, from memory.
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Quite a roller coaster ride, even at that speed.
There was also a line going north to Angeles City many years ago, the remnants of which were still in place when I first lived there in 1990.
