In the wind and rain of winter and no glimmer of the 
sun,
We leave the south behind us on that welcome northern 
run,
New motor just been fitted and she's barking from 
stack,
A snarling Detroit diesel underneath this big old Mack.

There's bull lights on her bumper and new chroming on 
her stack,
Her reconditioned gearbox has really brought her back, 
New booster on her intake and her head is made to suit,
And when I hold her open Holy Moses can she scoot!!

She's a road train geared for the open road and the 
inland highways,
Known to the rugged north and the dusty byways 
Big old Mack.

Two weeks too long away from all that diesel oil and 
grime,
Tonight we'll see the sun go down across that 
borderline, 
to sleep,
Your big repairs have left me broke and you've gotta 
earn your keep.

[Instrumental]

We're rollin' up the highway all the blues are in our 
wake,
The bogey wheels are humming to a good old country 
tape,
Two trailers on we dare to pass the truckies gasp in 
awe,
We're sailing round their modern trucks half throttle 
to the floor.

She knows that Goulburn highway and she knows old 
Goulburn Hill,
And the endless blue horizons on the road to Camooweal, 
She knows that sunset country where the wedge tailed 
eagle soars,
And the unforgiving distance of the lonely Nullabor.

She's a road train, geared for the open road and the 
inland highways,
Known to the rugged north and the dusty byways, 
Big old Mack, big old Mack.