The underground Depot maintenance complex has a total area of 84,444 square meters located at the 16 hectare North Ave. Extension in Quezon City. It serves as the headquarters for light and heavy maintenance and operation of the system.

A spur line connects the depot with the mainline rail tracks, providing ingress and egress for the movement of rail cars from both points.

The stabling, which is the temporary storage for revenue vehicle is composed of 9 tracks which is capable of storing 81 rail cars with space provided for the storage of 40 additional rail cars in the future.  The maximum running speed of trains inside the depot area is 15Kph.