Dhaka, Oct. 27 -- A fatal accident involving a falling part from Dhaka's Metro Rail has triggered fresh questions about the safety of Bangladesh's flagship transport project, just two years after it opened to great fanfare.

While metro rail accidents have been reported in many countries, engineers say incidents like Sunday's, where a part of the structure fell and killed a pedestrian in Dhaka, are extremely rare.

The tragedy has sparked questions about how a bearing pad, which supports the hundreds of tonnes of elevated metro infrastructure overhead, could suddenly come loose and crash onto a busy street in Khamarbari.

Engineers suggest the incident could be linked to design or construction flaws, while some have warned that the projec...