Mississippi River and Bonne Terre Railway
... that the engine frames of the Mississippi River and Bonne Terre Railway "had to be extra heavy ... to withstand rough usage"?
... that the engine frames of the <b id="mwTQ"><a href="./Mississippi_River_and_Bonne_Terre_Railway" id="mwTg" rel="mw:WikiLink" title="Mississippi River and Bonne Terre Railway">Mississippi River and Bonne Terre Railway</a></b> "had to be extra heavy ... to withstand rough usage"?