A man from Hemel Hempstead charged with rapes going back 24 years appeared at Aylesbury Crown Court on Monday.
John Anthony Walker, 51, of Moor End Lodge in Cotterells, faces two counts of rape and two of indecent assault.
He was remanded in custody until his next court date of January 3.
The first alleged rape took place in 1987 when a 25-year-old woman was attacked outside Wembley Park tube station.
The second alleged offence took place at Marlow Railway Station in Bucks in 1989 when an 18-year-old girl was raped in a workman’s hut.