Pingtung Railway Bunker

On my way home from Pingtung last week I took a few minutes to stop by the bunker on the railroad line there not far from Fangshan.

The bunker is nearly 2 kms long and appears to be constructed to protect trains in case of air attack. If you walk alongside it has airholes punched in the sides for ventilation.

The south opening. We searched around for a plaque or other explanation of what it is or when it was built, but couldn't find one. Cool, though. UPDATE: Map is here, I've marked the southern entrance.
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