The Sun Lounges were a fleet of three streamlined sleeper-lounge cars built by Pullman-Standard for the Seaboard Air Line Railroad (SAL) in 1956.

The Seaboard employed all three Sun Lounges on its flagship Silver Meteor between New York City and Miami, Florida.

The Chicago, Burlington and Quincy Railroad ("CB&Q") rebuilt a stainless steel Budd-built coach in their shops in Aurora, Illinois, with the Vista Dome design imagined and sketched by Cyrus Osborn.

The dome area featured seats positioned lengthwise in the cabin facing double-pane windows which were designed to improve insulation.

[1]: 197  While popular with travelers, dome cars could not be used on most railroads in the Eastern United States because of the low clearance on various tunnels.

[2]: 39  Even the low-slung "Strata-Domes", designed by Pullman-Standard for the Chesapeake and Ohio Railway, could not travel north of Washington, D.C.[3] due to low tunnel clearances in Baltimore and New York City.

The Illinois Central Railroad's Panama Limited, introduced in 1911, included a "sun-parlor" observation car, with wrap-around windows and a mahogany interior.