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The Santa Fe Refrigerator Despatch (SFRD) briefly experimented with dry ice as a cooling agent in 1931. The compound was readily available and seemed like an ideal replacement for frozen water. Dry ice melts at −109 °F or −78.33 °C (versus 32 °F or 0 °C for conventional ice) and was twice as effective thermodynamically.
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Such a region is commonly known as a U, for unit, RU for rack unit or, in German, HE, for Höheneinheit. Heights within racks are measured by this unit. Rack-mountable equipment is usually designed to occupy some integer number of U. For example, an oscilloscope might be 4U high. Rack-mountable computers and servers are mostly between 1U and 4U ...
In the mid-1970s, ÖBB decided to procure new vehicles for local transport in metropolitan areas, in particular for the Vienna rapid transport system.After several test runs with EMUs from other railways (including the DB 420 series), ÖBB ordered a total of 120 three-car sets of the 4020 series from SGP in several series for use on the Vienna express line and for regional transport in ...