Designs are underway for a 4-mile railway spur leading to the site of Faraday Future’s planned $1 billion factory site in North Las Vegas.

Government and Faraday Future officials shovel dirt during the groundbreaking for the company's planned 900-acre manufacturing site in North Las Vegas on Wednesday, April 13, 2016. Chase Stevens/Las Vegas Review-Journal Follow @csstevensphoto

Faraday Future Vice President of Manufacturing Dag Reckhorn waits for others during the groundbreaking for the company's planned 900-acre manufacturing site in North Las Vegas on Wednesday, April 13, 2016. Chase Stevens/Las Vegas Review-Journal Follow @csstevensphoto

The model for Faraday Future's planned 900-acre manufacturing site is shown during the groundbreaking event in North Las Vegas on Wednesday, April 13, 2016. Chase Stevens/Las Vegas Review-Journal Follow @csstevensphoto

Faraday Future Vice President of Supply Chain Tom Wessner, from left, Gov. Brian Sandoval, and Ding Lei, co-founder and global vice chairman of SEE Plan, hold glasses of champagne during the groundbreaking for Faraday Future's planned 900-acre manufacturing site in North Las Vegas on Wednesday, April 13, 2016. Chase Stevens/Las Vegas Review-Journal Follow @csstevensphoto

North Las Vegas Mayor John Lee, left, and Gov. Brian Sandoval hold glasses of champagne during the groundbreaking for Faraday Future's planned 900-acre manufacturing site in North Las Vegas on Wednesday, April 13, 2016. Chase Stevens/Las Vegas Review-Journal Follow @csstevensphoto

North Las Vegas Mayor John Lee, left, and Gov. Brian Sandoval listen during the groundbreaking for Faraday Future's planned 900-acre manufacturing site in North Las Vegas on Wednesday, April 13, 2016. Chase Stevens/Las Vegas Review-Journal Follow @csstevensphoto

Faraday Future Vice President of Manufacturing Dag Reckhorn speaks during the groundbreaking for the company's planned 900-acre manufacturing site in North Las Vegas on Wednesday, April 13, 2016. Chase Stevens/Las Vegas Review-Journal Follow @csstevensphoto

Gov. Brian Sandoval speaks with reporters following the groundbreaking for the Faraday Future's planned 900-acre manufacturing site in North Las Vegas on Wednesday, April 13, 2016. Chase Stevens/Las Vegas Review-Journal Follow @csstevensphoto

Designs are underway for a 4-mile railway spur leading to the site of Faraday Future’s planned $1 billion factory site in North Las Vegas.

With no discussion, the Regional Transportation Commission of Southern Nevada’s board of directors on Thursday approved a right-of-way agreement that allows the agency to build part of the rail line on property owned by Clark County.

Construction could start by next year on the rail spur, which calls for linking an existing main railroad line to a 3-million-square-foot plant where Faraday plans to manufacture electric vehicles, said Fred Ohene, the commission’s deputy general manager.

Costs to build the spur are still being calculated, with completion expected by late 2018, Ohene said.

The North Las Vegas Public Works Department issued a grading permit to Faraday in July, but company officials have not said when construction will start on the property, just west of U.S. Highway 93 and Grand Valley Parkway.

Moving forward, Faraday still needs to apply for permits to install underground utilities, lay the foundation and construct the building, city spokeswoman Delen Goldberg said.

Nevada lawmakers held a special session in 2015 to approve $215 million in tax incentives to attract Faraday to the state. The facility is expected to have 4,500 full-time employees, at least half of whom must be Nevada residents, as part of an agreement reached with the city.

Contact Art Marroquin at amarroquin@reviewjournal.com or 702-383-0336. Find @AMarroquin LV on Twitter.