ČD Class 840 and 841
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The ČD Class 840 and 841 diesel multiple units are two versions of the Stadler Regio-Shuttle RS1 built for České dráhy. 841 is the basic version, 840 is a modification for services on steep mountain lines. Since 2013, České dráhy have been using a marketing name for those trainsets, RegioSpider.[1]