The Indian Railways will come up with a policy in the next 7-8 days to make private-sector research and development a major part of the railway budget with 90 per cent allocation in the future, Union Minister Ashwini Vaishnaw said Wednesday. While speaking in the concluding session of a post-Budget webinar on technology-enabled development, the railway minister said the defence and space sector has already broken the silos by opening up research and development (R&D) for the private sector and the same needs to be done in other sectors as well.