Unless your weekend plans involve not leaving the house at all, you'll want to get clued up on which TfL lines are open for your 48 hours of freedom. Here's what you need to know:
Saturday and Sunday: No service between Romford and Upminster.
Sunday only: No service between Gospel Oak and Stratford, or between Gospel Oak and Barking until midnight.
Saturday and Sunday: No service between Hammersmith and Northfields/Uxbridge, and a reduced service between Hammersmith and Cockfosters.
Saturday and Sunday: No service between West Kensington and Ealing Broadway/Richmond.
Saturday and Sunday: No service Liverpool Street to Shenfield.
Sunday: No trains between Shenfield and Ilford until 8am.
Find more info on TfL's website.