When the snow fell on Wednesday morning, 90 points on the Central line failed, resulting in total chaos on the service.
The reason? Metronet, knowing there were freezing temperatures, had decided not to de-ice the points that night in order to save money. This money-saving measure ended up costing it £40,000 in fines to TfL. Obviously, that £40,000 could have been better spent on the upkeep of the lines - but the Infracos sometimes calculate that the fines are cheaper than doing the work.