Assertion: railroad's track | /r/HasProperty | 18-inch 460 mm
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Source sentences:
text: An improvement was made when "sectional track" became available in a variety of standardized lengths, such as the ubiquitous 9-inch (230 mm) straight and curved tracks of 15-inch (380 mm), 18-inch (460 mm), and 22-inch (560 mm) radii.