Later, in July 2022, the Special Event Line was revived, this time running from Balboa Avenue Transit Center (which had opened in the previous September as part of the Blue Line Mid-Coast extension to 12th and Imperial.

Special Event Line services from that time onwards run from Balboa Avenue Transit Center to 12th and Imperial, following the Green Line's alignment from 12th and Imperial to Old Town Transit Center.

They operated once every 15 minutes, during sporting events at Petco Park,[3] Qualcomm Stadium,[4] Cox Arena,[5] and the SDSU Open Air Theater (OAT),[5] as well as selected conventions and other major city events (such as San Diego Comic-Con).

[13] The Special Event Line was discontinued in 2012, as part of the Trolley Renewal Project.

[a] The entire route the Special Event line ran is now served by the Green Line (which had been extended from Old Town to 12th & Imperial), and MTS now opts to add cars and increase service on that route when needed.