Air carrier flight crew reported a conflict with another aircraft while taxiing at dfw.

Attributes
ACN	1449208
Time
Date	201705
Local Time Of Day	1201-1800
Place
Locale Reference	DFW.Airport
State Reference	TX
Environment
Light	Daylight
Aircraft 1
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Aircraft 2
Make Model Name	Medium Transport
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Conflict Ground Conflict Critical

Narrative:

We landed on 17L at dfw. Given the standard echo sierra route. On js ground was contacted. Given the clearance 'K' to the ramp. I proceeded up to K12 to make the right and left turn to transition to 'K.'I was about half way into the right turn when the first officer and I at the same time saw aircraft Y on 'K' taxing at a brisk pace. I slammed on the brakes and stopped short of 'K.' aircraft Y passed by without breaking pace.the passengers knew we had made an unusual stop. I taxied to [the] gate without any more issues. I called ATC ground control when I got into the terminal. I spoke with the supervisor. He agreed that I was following his instructions; as was aircraft Y; but aircraft Y decided to join 'K' sooner; and pass me before I got on 'K.' too close to be comfortable.

Original NASA ASRS Text

Title: Air carrier flight crew reported a conflict with another aircraft while taxiing at DFW.

Narrative: We landed on 17L at DFW. Given the standard Echo Sierra Route. On JS Ground was contacted. Given the clearance 'K' to the Ramp. I proceeded up to K12 to make the right and left turn to transition to 'K.'I was about half way into the right turn when the First Officer and I at the same time saw Aircraft Y on 'K' taxing at a brisk pace. I slammed on the brakes and stopped short of 'K.' Aircraft Y passed by without breaking pace.The passengers knew we had made an unusual stop. I taxied to [the] Gate without any more issues. I called ATC Ground control when I got into the terminal. I spoke with the Supervisor. He agreed that I was following his instructions; as was Aircraft Y; but Aircraft Y decided to join 'K' sooner; and pass me before I got on 'K.' Too close to be comfortable.

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.