ATOC will release the information through Holistic List Management, which has been profiling the data ahead of the sale of lists.
The information is drawn from 238,843 records of 16- to 25-year olds who hold a Young Persons card, 311,570 records of over-60s carrying a Senior Railcard, and 136,025 parents who hold a Family card.
ATOC has identified a range of companies likely to be interested in targeting the different groups. It is focusing on fashion, retail and music brands for the Young Persons information, while the over-60s data will be aimed at companies offering equity release products and specialist holiday operators such as Saga.
The Family Railcard data, most of which refers to consumers aged 35 to 55, will be marketed to travel and leisure brands, as well as theme parks and family-focused retailers such as Iceland and Asda.
Holistic List Management said that ATOC would be keen to forge deals with brands whose offerings supported those of the railcards, such as travel and travel insurance companies.
At the end of last year, ATOC launched a six-figure TV, radio and direct campaign backing a two-for-one entrance deal at London attractions, designed to boost the number of leisure train journeys taken by Londoners.
The work followed the hiring of Ian Fraser, who previously worked at the British Safety Council, as its marketing chief.