This is the tamper Plasser & Theurer Stopfexpress 09-3X. Top performance, precision and reliability are everyday demands placed on modern maintenance machinery. In rail construction, Plasser & Theuerer has developed an asynchronous balanced-pressure tamping system for tamping at a frequency of 35 Hz that assures precise geometric positioning of the tracks and the efficient manufacture of tie supports.The Stopfexpress 09-3X three-tie tamping machine works more uniformly by processing a longer length of rail per tamping cycle. It is also 40 percent faster than the previously fastest machines. So now you know that.