Workers stand at the entrance of a tunnel on May 4, 2016 at a construction site of a section of the Saudi capital Riyadh's $22.5 billion metro system. The system, which will have six lines covering 176 kilometres (109 miles), supported by a bus network of 1,150 kilometres, is due to be completed by the end of 2018. Deputy Crown Prince Mohammed bin Salman announced a long-term reform programme, dubbed "Vision 2030", marking the beginning of a hugely ambitious attempt to move Saudi Arabia beyond oil, the backbone of its economy for decades. / AFP PHOTO / FAYEZ NURELDINE

A $22.5 billion urban rail and bus system for the congested Saudi Arabian capital is on track, Riyadh’s governor said Wednesday, as other projects in the kingdom are delayed.

“No, no, it’s OK,” Prince Faisal bin Bandar told reporters.

“The project is going very well” and according to plan, he said on the sidelines of a ceremony to mark the end of digging part of the underground railway tunnel.

Prince Faisal spoke after riding a golf cart into a smoothly bored and reinforced tunnel from what will be Malaz station in south Riyadh.

For the moment, the future station on Line Three is still a rectangular hole in the ground, about a block long, and carved out of the rock for several floors down.

The governor said that what he saw underground was “assuring” and one-third of the Metro is now complete.

At the ceremony, he saw the cutting tool from a tunnel boring machine rise out of the ground at a site on Line Five where digging has been completed “before the scheduled time”.

The Metro employs seven such machines, whose cutting tools resemble monster-sized heads from an electric shaver, several metres (yards) in diameter.

“This project… is now going very quick,” one manager at the site told AFP.

Construction on the Riyadh Metro began in late 2013 and is targeted for completion by the end of 2018, much more quickly than similar projects in other countries.

It is the biggest infrastructure project in the history of the Saudi capital.

Work on the Metro intensified just before the oil revenues on which Saudi Arabia depends began to drop sharply.

The collapse in global crude prices by more than half since mid-2014 left the world’s biggest oil producer with a record budget deficit last year and a projected shortfall of $87 billion this year.

As a result, the government imposed unprecedented subsidy cuts on fuel, electricity and water. It delayed some major projects and held up receipts to contractors.

Last week, Deputy Crown Prince Mohammed bin Salman released the wide-ranging Vision 2030 plan to diversify the economy away from oil.

It calls for “high quality” public transport to help improve urban life.

Three foreign consortiums are building the Metro, with France’s Alstom, Canada’s Bombardier and Germany’s Siemens among the major participants.

The Metro’s six lines will cover 176 kilometres (109 miles), supported by a bus network of 1,150 kilometres.

About 40 percent of the system will be underground.

Work on the above-ground elevated railway is noticeable throughout the sprawling city of 5.7 million, where concrete supports and railway platforms are going up, forcing motorists into constant detours.