Built in 1952 by Pennsylvania Railroad, the "Queen Mary" was the world's largest freight car at the time. It was 121 feet long, weighed 250 tons and could carry 250 tons. Originally it was built as a depressed flatcar, class FD2. Later on in 1960 a "well" body was built for it to carry items which are narrow and tall like flywheel and rolling mill housings. The two bodies can be used interchangably on the same trucks depending which kind of load it is to carry. The Queen Mary was eventually retired in the 1990s during the Conrail era. The unit can be found today at the Altoona Railroaders Memorial Museum with the FD2 body. No one knows what became of the FW1 body.
My MOC is the FW1 version of the Queen Mary flatcar. It follows LEGO 6 wide train style. It has 16 axles of standard LEGO bogies in groups of 4. It is 84 studs long. It can negiotiate LEGO R40 curves and switches.
PRR FW1 Queen Mary Flatcar by dr_spock_888, on Flickr
LEGO Power Miners giant wheel load:
Serious overhang:
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