Narrative:

At sfo on taxiway G at intersection of G and a ground told us to follow [air carrier] after they passed us on a. [They] passed; captain cleared left; I looked to right and said 'stop'. A [different air carrier] aircraft was taxiing fast after [the first air carrier] on a with no lights on.stopped our aircraft immediately to avoid collision. [Second air carrier] continued taxiing. Queried ground; they said [second air carrier] taxied faster than they had expected. Ground had given us no indication that there would be an aircraft behind [the first air carrier] that we were instructed to follow. We taxied beyond our gate and requested taxi instructions back to our gate. Ground gave us return instructions and made no further comments.better coordination with ground regarding aircraft position; ground was unaware of location of [second air carrier] and its proximity to us.

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Original NASA ASRS Text

Title: EMB-175 FO reported a near collision taxiing at SFO with an aircraft that ATC seemed unaware of.

Narrative: At SFO on taxiway G at intersection of G and A Ground told us to follow [air carrier] after they passed us on A. [They] passed; Captain cleared left; I looked to right and said 'STOP'. A [different air carrier] aircraft was taxiing fast after [the first air carrier] on A with no lights on.Stopped our aircraft immediately to avoid collision. [Second air carrier] continued taxiing. Queried ground; they said [second air carrier] taxied faster than they had expected. Ground had given us no indication that there would be an aircraft behind [the first air carrier] that we were instructed to follow. We taxied beyond our gate and requested taxi instructions back to our gate. Ground gave us return instructions and made no further comments.Better coordination with ground regarding aircraft position; Ground was unaware of location of [second air carrier] and its proximity to us.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.