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, a development project known as the Rolls-Royce Mustang X, replaced the Allison engine with a Rolls-Royce Merlin 65 two-stage inter-cooled supercharged engine. During testing at Rolls-Royce's airfield at Hucknall in England, it was clear the engine 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 developing 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 5The 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 6Swiss & German co-production: world's first functional diesel–electric railcar 1914 (from Rail transport)
Image 7San Diego Trolley over Interstate 8 (from Road transport)
Image 8Arizona - North America - Southwest - Interstate Highway System (4893585908) (from Road transport)
Image 10German 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 11The engineering of this roundabout in Bristol, United Kingdom, attempts to make traffic flow free-moving.
Image 12Tunnels, such as the Tampere Tunnel, allow traffic to pass underground or through rock formations. (from Transport)
Image 16Customized motorcycle to maximize load capacity. Mobility is important for motorcycles, which are primarily used for transporting light cargo in urban areas. (from Transport)
Image 17Passengers waiting to board a tube train on the London Underground in the early 1900s (sketch by unknown artist)
Image 24First powered and controlled flight by the Wright brothers, December 17, 1903 (from Aviation)
Image 25European rail subsidies in euros per passenger-km for 2008 (from Rail transport)
Image 26Bardon 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 27Traffic congestion persists in São Paulo, Brazil, despite the no-drive days based on license numbers.
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)
Image 61Transport is a key component of growth and globalization, such as in Seattle, Washington, United States.
Image 62Modes of road transport in Dublin, 1929 (from Road transport)
Image 63According 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 640-Series Shinkansen, introduced in 1964, triggered the intercity train travel boom. (from Rail transport)
Image 65The Beijing Subway is one of the world's largest and busiest rapid transit networks. (from Transport)
A sailboat or sailing boat is a boat propelled partly or entirely by sails. The term covers a variety of boats, larger than small vessels such as sailboards and smaller than sailing ships, but distinctions in size are not strictly defined and what constitutes a sailing ship, sailboat, or a smaller vessel (such as a sailboard) varies by region and culture. Apart from size, sailboats may be distinguished by hull configuration (monohull, catamaran, trimaran), keel type (full, fin, wing, centerboard etc.), purpose (sport, racing, cruising), number and configuration of masts, and sail plan. Although sailboat terminology has varied across history, many terms now have specific meanings in the context of modern yachting.
... 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?
... 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?