Russia is stepping up transport security after a suicide bomb attack ripped through Moscow's Domodedovo airport last month, killing 36 people.
The trace detection systems will be installed at the 20 busiest metro stations by the end of March, manufacturers said on Tuesday.
President Dmitry Medvedev visited central Okhotny Ryad station in January to see how a pilot public security system worked.
The machines, known as Shelespers, scan individuals as they enter the underground network.
The Moscow Metro is one of the largest underground networks in the world, with 5 million passengers per day. It has been the target of several terrorist attacks, mainly from suicide bombers from Russia's mainly Muslim Caucasus region. The most recent attack, in March last year, killed 40 people and injured over 80.
MOSCOW, February 15 (RIA Novosti)
