Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 177; Flight Crew Total 15500; Flight Crew Type 8000
Communication Breakdown; Situational Awareness
Conflict Ground Conflict; Critical
Flight Crew Took Evasive Action
Human Factors; Procedure
Taxiing out of Gate X at ATL; we completed engine start and were cleared to join the left lane southbound. Weather was restricted visibility in moderate rain. As we approached the first vehicle lane crossing; the First Officer called out 'Look out' and 'Stop.'  I looked to the right and coming out of the corner of the right windshield I saw a tug pulling baggage carts; approaching at very high speed.  I braked to a quick stop.  We reported the near collision to Ramp Control.  We were not able to record the identification number on the vehicle as it was moving too fast.  There were no injuries or other adverse consequences.
Air carrier Captain reported a ground conflict with a baggage vehicle at ATL airport.