India, April 23 -- The launch of Delhi's new electric feeder bus service - branded the Delhi Electric Vehicle Interconnector (DEVI) - was postponed on Tuesday owing to state mourning declared by the Union government.

However, a preview of the service made one aspect clear: the buses will not carry advertisements, despite repeated advice from the Comptroller and Auditor General (CAG) to boost non-fare revenue through bus body wraps.

The DEVI fleet, comprising 330 nine-metre electric buses, was to be inaugurated from the Kushak Nallah depot on Tuesday, but the event was deferred after the government declared a three-day mourning to mark the passing of Pope Francis.

Meanwhile, the buses are ready for rollout, bearing the "DEVI" logo along...