From TfL:

On Thursday 12 January, strike action is expected to affect Elizabeth line services. If the strike goes ahead:

• There will be no service between Paddington and Abbey Wood all day, or before 07:30 on Friday 13 January
• A Saturday service will run between Liverpool Street (National Rail platform) and Shenfield, with additional services during peak hours
• There will be a reduced service of two trains per hour each between Paddington (National Rail platform) and Heathrow T4/Reading/Maidenhead, and no service to Heathrow T5
• On Friday 13 January, east and west services will start as normal, but will run to/from Paddington and Liverpool Street National Rail platforms until approximately 07:30 when the central section of the line is expected to open. A good service is expected from 09:00 across the line

All other services will run as normal but will be busier, particularly those in central London and DLR services.

From Friday 13 January until Tuesday 28 February, Elizabeth line services could be subject to short notice changes or cancellations due to industrial action.

Plan ahead, allow more time for your journey and check before you travel.

Visit our strike page for more information: https://tfl.gov.uk/campaign/strikes