bullhead rail

bullhead rail

n
(Railways) railways a rail having a cross section with a bulbous top and bottom, the top being larger. Now largely superseded by: flat-bottomed rail
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
He's collected gems including the last piece of bullhead rail ever rolled at Cargo Fleet, Head Wrightson railway chairs from 1887 and wagon plates dating back to 1946.