Strata-Domes
... that the Baltimore and Ohio Railroad's Strata-Domes were the first dome cars to operate in the Eastern United States?
... that the <a href="./Baltimore_and_Ohio_Railroad" id="mwB00" rel="mw:WikiLink" title="Baltimore and Ohio Railroad">Baltimore and Ohio Railroad</a>'s <b id="mwB04"><a href="./Strata-Dome" id="mwB08" rel="mw:WikiLink" title="Strata-Dome">Strata-Domes</a></b> were the first <a href="./Dome_car" id="mwB1A" rel="mw:WikiLink" title="Dome car">dome cars</a> to operate in the <a href="./Eastern_United_States" id="mwB1E" rel="mw:WikiLink" title="Eastern United States">Eastern United States</a>?