Big Dome
... that the Atchison, Topeka and Santa Fe Railway's "Big Dome" dome lounges remained on the El Capitan for just two years before being replaced by Hi-Level cars?
... that the <a href="./Atchison,_Topeka_and_Santa_Fe_Railway" id="mwAxs" rel="mw:WikiLink" title="Atchison, Topeka and Santa Fe Railway">Atchison, Topeka and Santa Fe Railway</a>'s "<b id="mwAxw"><a href="./Big_Dome" id="mwAx0" rel="mw:WikiLink" title="Big Dome">Big Dome</a></b>" <a class="mw-redirect" href="./Dome_lounge" id="mwAx4" rel="mw:WikiLink" title="Dome lounge">dome lounges</a> remained on the <i id="mwAx8"><a href="./El_Capitan_(train)" id="mwAyA" rel="mw:WikiLink" title="El Capitan (train)">El Capitan</a></i> for just two years before being replaced by <a href="./Hi-Level" id="mwAyE" rel="mw:WikiLink" title="Hi-Level">Hi-Level</a> cars?