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The Mack R series (also known as the Mack Model R) is a series of trucks that was manufactured by Mack Trucks from 1966 to 2005. The successor of the Mack B series , [ 2 ] the R was a heavy-duty truck (Class 8) with a conventional (bonneted) cab configuration.
The successor to the 1940-1956 Mack L series, [2] the B-series was a line of heavy conventional-cab trucks. Adopting a more streamlined appearance over its predecessor, the B-series was designed with a sloped windshield and larger, rounded fenders [ 1 ] The model line was sold in multiple configurations, including tractors and straight/rigid ...
Mack's design, influenced by their WWII era NO (7 + 1 ⁄ 2-ton, 6x6 truck), was chosen. Designed as an entire family of trucks, only the semi-tractor and cargo/prime mover were built. 392 M123 were built between 1955 and 1957 and 552 M125 were built between 1957 and 1958.
Thus, an outstretched hand reaching upward and pumping is a signal to the driver of an air horn equipped vehicle, requesting a toot. In modern trucks and buses, the horn is actuated by a button on the steering wheel (just like a normal car horn). Some trucks and buses have both electric and air horn, selectable by a switch on the dashboard.
To distinguish their sound from truck and bus air horns, train horns in the U.S. consist of groups of two to five horns (called "chimes") which have different notes, sounded together to form a chord. In Japan , most modern trains like 209 series or E233 series from the first half of the 1990s onwards use electric horns as primary in passenger use.
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