Hi, My family and I frequently disagree about the best way to get from central London to Greenwich. I think we should get the overground (direct, quickest, times feel erratic) but the rest of my family are all about the DLR (every 5 minutes). Since Greenwich is on the Thameslink service, we do get the dreaded 20 minute gap! I was just wondering if there was any academic research that explains the impact of erratic train frequencies. I remember London Reconnections doing a piece on the difference between 15/15/15/15 and 10/20/10/20 being noteworthy even though they were both 4 trains an hour.