Doubling off-peak frequency to Windsor and Reading

According to the SWR website, South Western Railway will be 'doubling off-peak frequency to four trains per hour to both Windsor and Reading'. I have seen details of the May 2019 timetable change and I don't think it will happen in May, so in which timetable change will it happen?

  • Hi, the timings of the extra services from Windsor and Reading to Waterloo can be found here > 

    https://bit.ly/2Fg9WQB

    These are during the Peak Monday - Friday when more services are required. We have not been advised regarding the Off-Peak services as to if these will be in the Winter 2019 timetable, as they will still need to be confirmed and finalised with Network Rail. I'm sure details will be advertised on our website once this happens.