noun
a specific width between the rails of a railway track that is narrower than the standard gauge
adjective
describing something as having a narrow width or being of a specific narrow gauge
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The railway line was built with a narrow gauge to accommodate the mountainous terrain.
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The old steam train runs on a narrow gauge track through the countryside.
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I love riding the tiny narrow gauge train at the amusement park.
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Her perspective on the issue was like a narrow gauge, limited and inflexible.