A teen at the centre of a vicious, unprovoked attack on a man at Corrimal railway station last year has been jailed for 2½ years.
Corrimal man Karl Greenland, 18, will spend a minimum of 12 months behind bars before he is eligible for release on parole.
Greenland, co-accused Joshua Gillings, and a third man - who cannot be named for legal reasons - repeatedly punched and kicked the 17-year-old victim unconscious one night in July 2012 before Greenland, the main aggressor, stomped on his head.
The assault left the young man with a broken jaw that required surgery.
Wollongong District Court judge Paul Conlon yesterday described Greenland's behaviour as "brutal and cowardly".
"Such assaults where thuggery and cowardness are involved are all too prevalent in our society," he said, adding anyone who came before the courts for such offences should expect nothing less than a jail sentence.
He said Greenland's action of taking a "two-footed leap" to jump on the victim's head was particularly disturbing.
"The potential for greater injuries was extreme," he said.
The court heard the victim and Greenland had been at the same house party in Corrimal earlier in the night.
However, when it was shut down, the victim and his friend walked to the train station intending to return to Dapto.
The pair were confronted by a large group, including Greenland, Gillings and the third co-accused, while waiting on the eastern platform.
Greenland punched the victim repeatedly while the crowd surged forward, surrounding the pair.
Gillings and the third co-accused joined in the attack, kicking and punching the boy until he lost consciousness.
Greenland then jumped in the air and stomped on the victim's head before the crowd dispersed, leaving the teen lying motionless on the platform.
Gillings and the third co-accused high-fived each other in celebration as they departed.
A short time later, some females from the group returned to the platform and called emergency services. The teen was taken to Wollongong Hospital before being transferred to St George where he underwent surgery.
Greenland and the 17-year-old co-accused were arrested two days later at Bellambi, while Gillings was charged last August.
Gillings will be sentenced for his role in the attack today.
The third co-accused has already been sentenced to an 18-month suspended control order.