narrow gauge
US /ˌner.oʊ ˈɡeɪdʒ/
UK /ˌner.oʊ ˈɡeɪdʒ/
1.
a railway track that is narrower than the standard width (4 feet 8.5 inches or 1.435 meters)
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The old mining town was served by a narrow gauge railway.
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Building a narrow gauge line is often cheaper for mountainous regions.
1.
having a railway track that is narrower than the standard width
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The train ran on a narrow-gauge line through the mountains.
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They are planning to restore the old narrow-gauge railroad.