GoA2
Automatic train operation with a driver retained. The honest tier — and the one several systems are running while their press releases say GoA4.
How this list is decided. Membership is not a field an editor set: it is every published entry whose own text names GoA2, matched at build time, with the sentence printed under each row so you can judge the match yourself. 5 entries in 5 cities. For what the term means rather than who uses it, see Grades of Automation (GoA) in the glossary.
✔ Every published entry is checked against the public sources it cites before publication.
Where it appears in the atlas
Argentina handed its 1913 metro to the city in 2012, and the city agency SBASE has since put Siemens Trainguard MT CBTC on three of six lines — H in 2016, C in 2020, D in 2024 — and in August 2026 awarded Line B's resignalling to China's CRRC, again at GoA2.
CBTC signalling drives the trains automatically, but a driver stays in the cab — GoA2, not driverless.
Trade press review at four years: GoA2 CBTC by CASCO, O&M consortium, July 2024 average 192,510, record day 277,873, 200 million cumulative, pre-launch forecast.
'High capacity signalling' and CBTC are not synonyms for driverless operation — Melbourne's system is GoA2 (automatic train operation with a driver retained onboard for doors, supervision and emergencies), the same automation tier as many modernized European ETCS lines, not the GoA4 unattended operation used on genu…
Trains run under Automatic Train Protection/Automatic Train Operation with a driver aboard for door operation and monitoring — this is supervised (GoA2) automation, not unattended operation.
Others in this group
The whole layer
Every standard, protocol and licence the atlas names, with the open-data licence ladder in one table: Standards & licences.