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The Caledonian Railway 721 Class (known as the "Dunalastair" class) was a class of 4-4-0 steam locomotives designed by John F. McIntosh for the Caledonian Railway (CR) and introduced in 1896. [1]
These were the Caledonian's last express passenger locomotives, and technically, the last of the Dunalastair series, and were unofficially dubbed, Dunalastair V. [ citation needed ] Numbering
Dunalastair (Scottish Gaelic: Dùn Alastair, meaning "fort of Alexander") is an estate in the southern part of the Highlands, in Perthshire, Scotland. [ 1 ] [ 2 ] It is 18 miles west of the town of Pitlochry , lying along the River Tummel between Tummel Bridge to the east and Kinloch Rannoch to the west, and incorporates part of Dunalastair Water .
In an effort to avoid these requirements, McIntosh designed a large 4-6-0 based on his 'Dunalastair' series of 4-4-0s. Two locomotives were built in 1903, and immediately became the Caledonian's flagship locomotives.
The class number used for Caledonian Railway engines was the stock number of the first member of the class to reach traffic. Hence earlier numbered classes could well have appeared later in time.
McIntosh's most famous design is the Dunalastair Class 4-4-0. [3] Other designs include: Caledonian Railway 19, 92 and 439 classes 0-4-4T (2P) Caledonian Railway 29 & 782 classes 0-6-0T (3F) Caledonian Railway 498 Class 0-6-0T (2F) Caledonian Railway 104 Class 0-4-4T (1P) Caledonian Railway 781 Class 0-4-0T; Caledonian Railway 492 Class 0-8-0T (4F)
Table of locomotives, 652 Class Year Quantity CR Nos. Builder Builders No. LMS Nos. BR Nos. Notes 1908: 8: 652–659: CR, St. Rollox: Y087-Y086: 17629–17636
A dam was built at Dunalastair, 4 miles (6.4 km) below the control weir, creating a new loch called Dunalastair Water. Three miles (4.8 km) of open aqueduct were constructed, running from the dam along the south side of the valley, at the end of which the water descended 170 ft (52 m) through two steel pipes to reach the Tummel power station ...