Feb 13 (Reuters) - Aurizon Holdings Ltd AZJ.AX
* hy underlying npat $ 279 million versus $237 million a year ago
* Hy total revenue $ 1.781 billion versus $1.76 billion a year ago
* " fy2017 guidance range unchanged"
* Interim dividend 13.6 cps
* underlying effective tax rate for fy2017 is expected to be in range of 28-30% and underlying cash tax rate is expected to be less than 20% for short to medium-term. Source text for Eikon: ID:nASX9k5S0D Further company coverage: AZJ.AX