Posted Mar 2, 2021, 6:06 PM
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Resu Deretsiger
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Join Date: Feb 2004
Location: Lake County, CA
Posts: 15,072
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I got this from the wiki and lol at "great stability and smoother riding qualities" 
Quote:
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The Bay Area Rapid Transit system is the only operating railroad in the United States to use 1,676 mm (5 ft 6 in) broad gauge, with 120 miles (190 km) of double tracked routes. The original engineers chose the wide gauge for its "great stability and smoother riding qualities"[4] and intended to make a state-of-the-art system for other municipalities to emulate. The use of 1,676 mm (5 ft 6 in) broad gauge rails was one of many unconventional design elements included in its design which, in addition to its unusual gauge, also uses flat-edge rail, rather than typical rail that angles slightly inward. This has complicated maintenance of the system, as it requires custom wheelsets, brake systems, and track maintenance vehicles
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All this great stuff made it incompatible with everything else and more expensive.
source
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