a transition between regular rolling stock, and double deck stock. To facilitate this, one vestibule of the car was lower, while the other was at the height of the upper vestibule of the double deck stock. Amtrak utilized these cars for a time, primarily in situations where cars inherited from other railroads made up the bulk of Amtrak's rolling stock. All these El Capitan cars were used heavily in the early days of Amtrak, and served as a pattern when Amtrak began to purchase, or produce, its own double deck cars. The majority of transition cars were scrapped, though a few were kept in service and rebuilt into more "traditional" high-vestibule double-deck cars. Dome lounge A dome lounge is a type of domed railroad passenger car that includes lounge, cafe, dining or other space on the upper level or both levels of the car. Examples include both short (approximately half the length of the car, with the dome located just forward or just rearward of the car's center) and full (taking almost the entire length of the car). Some examples include sleeping compartments or coach seating. Classic dome lounges (built during the streamliner era in the U.S. and Canada) include: "Super Dome" full-length cars were built by Pullman-Standard in 1952 for the Chicago, Milwaukee, St. Paul & Pacific, also known as the Milwaukee Road, and operated in the railroad's Hiawatha passenger train fleet. Ten cars were initially constructed, with one of these destroyed in a derailment while on a test run and later rebuilt using new parts and parts salvaged from the original destroyed car. "Big Dome" full-length cars built by the Budd Company in 1954 for the Atchison, Topeka & Santa Fe for the railroad's passenger train fleet. Fourteen of these were built in two groups, one group of which included crew dormitory space on the lower level. "Great Dome" full-length cars built by the Budd Company in 1956 for the Great Northern Railway for its Empire Builder train. Six of these were built; one of them was actually owned by the Chicago, Burlington & Quincy, over which the train operated between Chicago and the Twin Cities. One former Great Northern car number 1391, Ocean View, remains in Amtrak ownership. "Pleasure Dome" short dome cars built by Pullman-Standard in 1950 for the Atchison, Topeka & Santa Fe for its Super Chief train. The six cars had both lounge and