The way points of this bicycle route:
Check out www.otagocentralrailtrail.co.nz for all the links you will need. Also, check out Auckland Cycle Touring Association at www.geocities.com/actanz/
Price's Creek Tunnel is about here.
Site of the Hyde Derailment 4 June, 1943.
From here you can catch the train to Dunedin, or cycle on to Pukerangi and catch it there. Check out www.otagocentralrailtrail.co.nz for all the links you will need.