ENR's 2020 Award of Excellence winner, LA Metro's sustainability chief, reflects on decades of work and how engineering and building the right infrastructure can have lasting impact.

The Los Angeles County Metropolitan Transportation Authority (Metro) on Monday unveiled two new tunnel boring machines (TBMs) for the authority's $9.3 billion Purple Line Extension project, which will connect subway transit service from downtown Los Angeles to the city's westside by 2027.

The $2.1-billion Purple Line Extension Transit Project Section 1 in Los Angeles reached a major milestone recently, as two tunnel boring machines (TBMs) began carving out twin tunnels for the project.

The nine-mile-long Purple Line Extension is heading toward the high rent district.