Source: The Boring Company - Music City Loop Blog, Aug. 1, 2026
The Music City Loop Is Scaling Up
Six months after Nashville’s first Prufrock became ready to mine, the Music City Loop looks very different. Two tunnel boring machines are now active beneath the city, a third is expected in September, and The Boring Company says more than 40 stations are in various stages of planning and design.
The company’s August update offers the clearest picture yet of a project moving from a single construction site toward a larger network-building operation.
Two Active TBMs
Prufrock-MB1 continues to advance underground with what TBC describes as consistent week-over-week performance improvements. Prufrock-MB2 has now completed commissioning and launched from Lot 16, beginning its own early testing and upgrade period.
A second vertical cassette is also operating to support MB2’s continuous rock-removal system. That gives the Nashville site the ability to handle spoil from two simultaneous tunneling operations.
MB3 Is Scheduled for September
The company says Prufrock-MB3 is on track to arrive in Nashville in September. Unlike the first machine, MB3 will be built with lessons from two Nashville launches already in hand.
TBC says those lessons should make the third machine significantly more efficient from the beginning. If that proves true in the field, MB3 could be an important test of whether the company’s rapid iteration strategy translates into materially faster tunnel production.
Stations Are Advancing Too
The underground work is only one side of the project. TBC says more than 40 stations are in various stages of planning and design with property owners.
The company points to several concrete examples: the BNA connection and station are moving through design and permitting; the Music City Center tunnel easement has been approved while station design continues; the first residential station agreement will serve PRIME, Alcove and Paramount; and TBC says it has agreed to terms for a station at the JW Marriott in downtown Nashville.
The Network Is Becoming More Tangible
The August update ties together developments that had previously appeared as separate stories: permits, tunneling, property agreements and station negotiations. They now look increasingly like pieces of one network.
The challenge ahead is execution. Multiple machines have to sustain production, additional launch sites have to come online, and dozens of station concepts have to move from planning to construction. But compared with the project Nashville was watching at the beginning of the year, the Music City Loop is clearly in a new phase.
Disclaimer
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