Riyadh train drilling machines have come a long way in digging the tunnels as the Riyadh train Twitter account announced that the seven drilling machines(TBM)have traveled more than 17 km, with deep tunnels reaching 50%.

The Riyadh train project includes 7 giant tunnel boring machines, each between 90 and 120 meters long, capable of digging at depths of up to 30 meters safely underground without affecting the structure, and perform many tasks including moving soil, building tunnel walls and laying railways inside the tunnels.