Travelling through London using public transport is no longer as fun as it once was. Ticket barriers scrutinise every passenger, causing delays while the constant presence of armed police and private security makes everyone feel like a terrorist. One of the great advantages of travelling by rail is that it allows you to by-pass the hassles of airport security. What next? Check in times for trains? Boarding passes on the Underground?
As for terror threat levels, they might as well be ignored today. To leave threat levels elevated for months simply creates a new normal.
Airport-style screening to be considered for train and tube stations | The Guardian