The Mustang was designed to use the Allison V-1710 engine without an export-sensitive turbosupercharger or a multi-stage supercharger, resulting in limited high-altitude performance. The aircraft was first flown operationally and very successfully by the RAF and as a tactical-reconnaissance aircraft and fighter-bomber (Mustang Mk I). In mid 1942, Rolls Royce replaced the Allison with a Rolls-Royce Merlin 65, two-stage intercooled supercharged engine, resulting in a series of development aircraft known as the Mustang X. During testing at Hucknall, it quickly became clear that this dramatically improved the aircraft's performance at altitudes above 15,000 ft (4,600 m) (without sacrificing range). Following receipt of the test results and after further flights by a number of USAAF pilots, the results were so positive that North American began work on converting several aircraft and these were developed into the P-51B/C (Mustang Mk III) model, which became the first long range fighter to be able to compete with the Luftwaffe's fighters. The definitive version, the P-51D, was powered by the Packard V-1650-7, a license-built version of the two-speed, two-stage-superchargedMerlin 66, and was armed with six .50 caliber (12.7 mm) AN/M2 Browning machine guns. (Full article...)
Image 8First powered and controlled flight by the Wright brothers, December 17, 1903 (from Aviation)
Image 9The Great North Road near High gate on the approach to London before turnpiking. The highway was deeply rutted and spread onto adjoining land. (from Road transport)
Image 10Passengers waiting to board a tube train on the London Underground in the early 1900s (sketch by unknown artist)
Image 11According to Eurostat and the European Railway Agency, the fatality risk for passengers and occupants on European railways is 28 times lower when compared with car usage (based on data by EU-27 member nations, 2008–2010). (from Rail transport)
Image 12Bridges, such as Golden Gate Bridge, allow roads and railways to cross bodies of water. (from Transport)
Image 14Bardon Hill box in England (seen here in 2009) is a Midland Railway box dating from 1899, although the original mechanical lever frame has been replaced by electrical switches. (from Rail transport)
Image 19German soldiers in a railway car on the way to the front in August 1914. The message on the car reads Von München über Metz nach Paris ("From Munich via Metz to Paris"). (from Rail transport)
Image 20Swiss & German co-production: world's first functional diesel–electric railcar 1914 (from Rail transport)
Image 21Bulk cargo of minerals on a train (from Rail transport)
Image 46A cast iron fishbelly edge rail manufactured by Outram at the Butterley Company for the Cromford and High Peak Railway in 1831; these are smooth edge rails for wheels with flanges. (from Rail transport)
... that when Charles P. Gross became the chairman of the New York City Board of Transportation, the mayor told him that "if you think war is Hell, then you have something waiting for you on this job"?
... that a section of Mississippi Highway 489 was designated as the Jason Boyd Memorial Highway to commemorate the MDOT superintendent who was killed while removing debris from the road?
... that United States Secretary of Transportation Pete Buttigieg wrote an essay in 2000 on Bernie Sanders, his future competitor in the 2020 Democratic Party presidential primaries?
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