The Home Office has revealed that people travelling on the Tube and rail networks could be subject to airport-style security checks. A research brief by the department sets out plans for a search for new technologies capable of screening the high volumes of passengers using the networks, the results of which are due next spring.
In the aftermath of the terrorist attacks on July 7 2005. the DfT carried out trials into the use of mass passenger screening at five mainline rail and tube stations in London in 2006 (see link to Ipsos Mori report). The use of airport-style screening was ruled out in 2008 on the basis that technology at that time meant it was not feasible to introduce 100% screening of such large passenger flows at the thousands of entry points on the UK rail and underground networks.
Of course, where policy initiatives by our political class are concerned, there is usually an ‘EU element’ hidden behind them and screening of train and tube passengers is such an element. On 31st May 2012 the EU Commission issued a Commission Staff Working Document on Transport Security; sections 4.1; 4.1.1 and 4.1.2 (pages 4/5) are particularly relevant.
Update: With thanks to IPJ (comments below) this is of interest