A passenger was dragged 600m under a bus in central Wellington before the driver realised anything was wrong, the Tramways Union says.
Emergency services were called to Taranaki St just before 10pm on Saturday after the pedestrian was killed in the incident.
Cordons were put in place and motorists were asked to avoid the Taranaki St area between Ghuznee St and Bidwill St.
Police spent the night examining the scene and the road didn't reopen until the following morning.
A police spokesperson said it was "quite a significant" crash scene in terms of the size of the area and it took some time to process.