It is an invasive import form Australia. We have Eucalyptus, Black Wattle and Port Jackson Willow which are varying degrees of nuisance, depending where you live.
We have Port Jackson in the Western Cape that regularly contributes to the big fires we have when our local Fynbos does it's regeneration burn.
On the other hand, Eucalyptus in the fireplace really gives a good burn, plus, my wife's lungs don't mind it as opposed to Port Jackson which has her wheezing in short order.
I remember hearing as a kid that sleepers were Rhodesian Teak, but that was phased out in favour of the locally grown Jarrah.