DRIFT-IIb, which is located 1100 m underground in the Boulby Underground Laboratory at the Boulby Mine in and DRIFT-IIc, which is located on the surface at Occidental College, Los Angeles, California, USA.
This line is still in operation today to serve a steelworks at Skinningrove and the Boulby potash mine, although passenger trains ceased in 1951.
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