Anger among commuters trapped on a train crowded with U2 fans, rather than random idiocy, is being blamed for disrupted rail services to the first of the Irish band's two Mt Smart concerts.

Consultants have produced a glowing business case for a $2 billion-plus inner Auckland rail tunnel.

Auckland Mayor Len Brown expects a $2 billion rail tunnel through central Auckland to be completed within seven years, but who will pick up the bill remains uncertain.

A 50-year-old bus driver sacked for sexual harassment denies the claims - but admits she talked about getting 'pissed' with 15-year-olds.