I'd agree that the icy conditions played a major part in this accident. The lorry certainly looks like it was skidding as it entered the crossing, possibly due to late braking if the driver was, as has been suggested earlier, inexperienced. It is, however, strange that the crossing was not equipped with the heavy metal barriers which rise out of the road surface to stop vehicles encroaching on to the railway, a feature found at most level crossings in Russia.