"It was a frightening and demeaning experience for the young victim, who no longer feels able to travel on public transport by herself," Chief Judge Peter Martino said.
Alton John Samson was serving the final stages of a seven-year jail term and was due for release on May 22 when the Director of Public Prosecutions filed an application on May 9.
Samson suffers from schizophrenia and is an involuntary patient at Graylands Hospital.
She has ongoing anxiety, anger and depression." Sachman was on bail for stalking offences in Busselton when he molested the girl.
The court was told how Sachman made sexually explicit and threatening phone calls to a woman once described as a friend who owed him $200.
News (10-5-2012)- A man has been sentenced to almost seven years in jail for raping a woman in Broome in north-west Western Australia.
Leslie Samit, 36, pleaded not guilty to sexual penetration without consent and assault but was found guilty by a jury in the Perth District Court late last year.
"Your conduct caused considerable distress and anxiety to the victim, and has also had a long-standing impact upon her, causing anxiety and loss of confidence and restriction in her social and work activities," Chief Judge Martino said of the stalking matter.
Sachman was also sentenced over a crash on South Street, Kardinya, when he was driving without a valid licence.
Sachman was filmed following the teenager when she left the train at Greenwood station.