Three cars on a train carrying <a href="https://en.wikipedia.org/wiki/RDX" id="mwAUU" rel="mw:WikiLink" title="RDX">hexogen</a> to <a href="https://en.wikipedia.org/wiki/Kazakhstan" id="mwAUY" rel="mw:WikiLink" title="Kazakhstan">Kazakhstan</a> <a href="https://en.wikipedia.org/wiki/Arzamas_train_disaster" id="mwAUc" rel="mw:WikiLink" title="Arzamas train disaster">explode</a> in <a href="https://en.wikipedia.org/wiki/Arzamas" id="mwAUg" rel="mw:WikiLink" title="Arzamas">Arzamas</a>, <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Gorky_Oblast" id="mwAUk" rel="mw:WikiLink" title="Gorky Oblast">Gorky Oblast</a>, <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mwAUo" rel="mw:WikiLink" title="Soviet Union">USSR</a>, killing 91 and injuring about 1,500.