Having finally begun moving the first passengers through its Las Vegas tunnels back in June, The Boring Company has now received initial approval to expand the system across the city. Local officials have today ticked off the startup’s plans to build out the subterranean transport network, which could amount to as many as 51 stations.

The Boring Company’s current tunnel system consists of a pair of one-way tubes running beneath the Las Vegas Convention Center, which opened earlier this year to shuttle visitors between stations at either end of the facility. This takes place aboard electric Teslas steered through the tunnels by human drivers at speeds of up to 40 mph (64 km/h).

But expanding the tunnel system outwards to connect with other casinos and other locations around Las Vegas has always been part of the firm’s plans. Clark County officials today approved an agreement with The Boring Company to “establish and maintain” a transportation system beneath the Las Vegas strip, which it says will include the 51 stations and 29 miles of tunnels.

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