Steam Locomotives of a More Leisurely Era 1896 Dunalastairs Caledonian Railway

Steam Locomotives of a More Leisurely Era

1896 Dunalastairs

Caledonian Railway

Dunalastair I No.14318 as finally running in 1932.

J.F.McIntosh’s first engines for the Caledonian Railway after his accession in 1895 were the famous Dunalastair class 4-4-0s, which at the time of their appearance were amongst the largest engines in the country.  The design was in effect a development of the somewhat similar engines built by Lambie in 1894, which had in turn evolved from those built by Dugald Drummond in 1884.  The Dunalastairs themselves were again gradually enlarged, and four distinct varieties, known as the Dunalastair I, II, III and Dunalastair IV classes, appeared between 1895 and 1910.  The last engine of the 1910 batch was fitted with a superheater and some of the dimensions were modified.  It was the first superheated engine in Scotland and one of the first in Great Britain.  Following on its success another 21 similar engines were built between 1911 and 1914.  Finally W.Pickerskill introduced yet another enlargement of the design, of which 48 were constructed between 1916 and 1922.  Most of these were still running in 1959 as BR Nos. 54461-54508, but the last of the Dunalastair IV’s had gone by 1957.  The LMS numbers of the Dunalastair I’s were 14311-25: these all went in the early 1930s.  The Dunalastair II’s were 14326-36, of which the last survivor was 14333 in 1947, and the Dunalastair III’s were 14337-65 (a few were rebuilt to IV).  Several of these lasted until the late 1940s.  Nos. 14330-60 were the IV’s, some of which had been rebuilt from Dunalastair II or III class.

A pair of McIntosh ‘Dunalastair III’ class 2P 4-4-0s, with No.14348 leading, prepare to leave Callender with a special train for Dunblane in 1936.  E.E.Smith

Dunalastair I – Driving wheels – 6’ 6”,  Cylinders – 18¼”x 26”,  Pressure – 160lb.,  Tractive effort – 15100lb.,  Weight – 47 tons,  LMS classification – 2P

Dunalastair II – Driving wheels – 6’ 6”,  Cylinders – 19”x 26”,  Pressure – 175lb.,  Tractive effort – 17900lb.,  Weight – 49 tons,  LMS classification – 2P

Dunalastair III – Driving wheels – 6’ 6”,  Cylinders – 19”x 26”,  Pressure – 180lb.,  Tractive effort – 18411lb.,  Weight – 51 tons 14 cwt,  LMS classification – 3P

Dunalastair IV – Driving wheels – 6’ 6”,  Cylinders – 20¼”x 26”,  Pressure – 180lb.,  Tractive effort – 20915lb.,  Weight – 61 tons 5 cwt,  LMS classification – 3P

Pickersgill – Driving wheels – 6’ 6”,  Cylinders – 20”x 26”*,  Pressure – 180lb.,  Tractive effort – 20400lb*.,  Weight – 61 tons 5 cwt,  LMS classification – 3P  (* the later engines had 20½”x 26” cylinders, with tractive effort  21435 lb.)

‘Dunalastair IV’ superheated rebuild, class 3P 4-4-0 No.14439, allocated to Carstairs shed, heads a southbound coal train near Uddington on August 23, 1947.  No.14439 survived to be the last of all the 87 McIntosh 4-4-0s when withdrawn from the Highland section in 1958.  E.R.Wethersett.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s