520
... that the Pennsylvania Railroad steam locomotive 520 had its boiler explode and pulled a "railfan special", before it was preserved in the Railroad Museum of Pennsylvania?
... that the <a href="./Pennsylvania_Railroad" id="mwEKM" rel="mw:WikiLink" title="Pennsylvania Railroad">Pennsylvania Railroad</a> <a href="./Steam_locomotive" id="mwEKQ" rel="mw:WikiLink" title="Steam locomotive">steam locomotive</a> <b id="mwEKU"><a class="mw-redirect" href="./PRR_520" id="mwEKY" rel="mw:WikiLink" title="PRR 520">520</a></b> had its <a href="./Boiler" id="mwEKc" rel="mw:WikiLink" title="Boiler">boiler</a> <a href="./Boiler_explosion" id="mwEKg" rel="mw:WikiLink" title="Boiler explosion">explode</a> and pulled a "<a href="./Railfan" id="mwEKk" rel="mw:WikiLink" title="Railfan">railfan</a> special", before it was preserved in the <a href="./Railroad_Museum_of_Pennsylvania" id="mwEKo" rel="mw:WikiLink" title="Railroad Museum of Pennsylvania">Railroad Museum of Pennsylvania</a>?