http://www.military-today.com/engineering/mtu_90.htm The MTU-90 armored bridgelayer is designed to launch bridge for tanks and other combat vehicles across trenches and water obstacles in combat conditions. It was developed to replace the ageing MTU-20 and MTU-72 armored bridgelayers, based on the T-55 and T-72 tanks. More information on Military-Today.com website.