Beaver Tail
... that the Milwaukee Road's Beaver Tail parlor-observation cars were so-named because of their distinctive flat, sloped rear area?
... that the <a class="mw-redirect" href="./Chicago,_Milwaukee,_St._Paul_and_Pacific_Railroad" id="mwC6Q" rel="mw:WikiLink" title="Chicago, Milwaukee, St. Paul and Pacific Railroad">Milwaukee Road</a>'s <b id="mwC6U"><a class="mw-redirect" href="./Beaver_Tail_(American_railcar)" id="mwC6Y" rel="mw:WikiLink" title="Beaver Tail (American railcar)">Beaver Tail</a></b> <a href="./Observation_car" id="mwC6c" rel="mw:WikiLink" title="Observation car">parlor-observation</a> cars <i id="mwC6g">(pictured)</i> were so-named because of their distinctive flat, sloped rear area?