1948 publicity photo of a Chicago, Milwaukee, St. Paul &amp; Pacific Railroad &quot;Skytop&quot; lounge car. The Milwaukee&#x27;s streamlined Hiawatha passenger trains featured a variety of distinctive observation cars. The fourth and final design was the Skytop Lounge, styled by industrial designer Brooks Stevens and produced by the Milwaukee Shops in 1948. The cars&#x27; round ends were 90% glass and included 24 revolving chairs, plus a drawing room.