Police are asking any witnesses, or anyone who may have information about the attack on the 13-year-old girl to contact them. The victim was raped at around 9pm on Saturday, 30 November.
Anyone with information is asked to call Crimestoppers anonymously on 0800 555 111.
More top news
George Osborne told MPs London would shoulder a large part of his 37% reduction in transport funding.
The prison was originally opened in 1852 as a mixed prison before becoming the first female-only local prison in England in 1902.
The victim was travelling between Seven Sisters and Highbury and Islington when she was assaulted.