The union representing bus drivers is happy with the launch of Wellington's new bus network

Commuters will be hoping for a smoother ride into work this morning after issues with late services and a shortage of buses on some routes yesterday.

The network has undergone its biggest change ever, after Tranzit took over the contract for most commuter routes on Sunday.

Wellington Tramways Union Secretary Kevin O'Sullivan says there have been a few teething problems, but no major issues with the changeover.