r/MachinePorn•13 yr. agojweaver120Trailing gear for the world's largest tunnel boring machine, Bertha [2013][2673x1782][OC]Posted Apr 13, 2013, 11:27 PM UTC291Share
![Trailing gear for the world's largest tunnel boring machine, Bertha [2013][2673x1782][OC]](/api/ImgurImages?id=yyArEgZ.jpg)