From Kundapur Railway station there is no direct transport facilities you have to come to KSRTC bus stand which is nearly 6kms for the railways station...from there it is just 1:15 journey time to kollur mookambika....from bus stand the temple is just 1kms....
you will get plenty of KSRTC buses and even you can go with the private services but i suggest to you have the KSRTC service....don't hire the private cabs wait for some time if bus is not available at the bus station....