It is a Robbins Double Shield with a diameter of 5,06 meters.
It is reported that it bored 12,2 km in 18 months `8 months ahead of schedule' and with a progress of '1.000 m per month' (this is what Robbins says).
Robbins Crossover TBMs are the adaptable solution to the world’s most challenging tunnel projects. This video explains how Robbins Crossover XREs, a hybrid of Hard Rock and EPB TBMs, work and why they are the solution for mixed ground tunnels...