The woman has also described the second time she says Bill Roache assaulted her, a few months later.
This attack she described as lasting just a few minutes - again in complete silence. Roache overpowered her, she says, by pressing her against a wall with his arm.
"I was only tiny when I was in my teens," she told the court. "He was much bigger than me. I was trying to find a way out, but he was bigger than me. I couldn't manoeuvre myself at all. But he wasn't prepared to let me go until he was ready."
Roache's barrister, Louise Blackwell, asked for details of what happened immediately afterwards.
But the woman said: "I never thought I'd ever repeat these events. I buried them for 47 years. Now you ask me to recall every single detail, I just can't do it."
The 62-year-old says she suffered from depression for several years after the attacks took place.
Coronation Street actor Bill Roache has been defended by some of his co-stars at his trial at Preston Crown Court.
On his first day of evidence, actor Bill Roache denied all of the allegations against him insisting he had no interest in 'gratuitous sex'
A woman has told the trial of Coronation Street's Bill Roache that the actor raped her on two occasions when she was 15 years old in 1967.