It became obvious that, for all the Fairlie locomotive's advantages, its disadvantages outweighed them.

In 1872, the first Fairlie locomotives arrived from England, the E class.

The first Fairlie locomotives later became known as Double Fairlies.

More Fairlie locomotives were built or restored and new carriages were built.

NB also introduced the Modified Fairlie locomotive in 1924.

Fairlie refers to the Fairlie locomotive, a type of railway steam locomotive.

An early and unsuccessful purchaser of the new Fairlie locomotive, when in 1863 the railway reached Crynant, coal mining quickly expanded.

Other, less common, variations included the Fairlie locomotive, which had two boilers back-to-back on a common frame, with two separate power bogies.

In 1874, New Zealand Railways ordered two types of Double Fairlie locomotives from Avonside.

The Fairlie locomotive was invented and patented in 1864 by the Scottish engineer Robert Francis Fairlie.

"The Fairlie Locomotive"; Rowland A S Abbott; pub.

Robert Fairlie, the designer of the Fairlie locomotive that pioneered on the Festiniog Railway, was also an advocate of narrow gauge.

Examples of this type were constructed as Shay, Heisler, Climax, Mallet, Meyer and Double Fairlie locomotives.

The Ffestiniog went on to own a total of six Fairlie locomotives, with three in service in 2011, and one on display at the National Railway Museum.

George England's daughter, Eliza Anne, had earlier eloped with Robert Francis Fairlie, the inventor of the Fairlie locomotive.

The locomotive stock consisted of five 0-6-2 tank locomotives of British manufacture, as well as two 0-6+6-0 Fairlie locomotives manufactured by the Yorkshire Engine Company.

A number of Fairlie locomotives were built, including Taliesin for the Ffestiniog Railway and Josephine one of the NZR E class (1872).

They had Walschaerts valve gear, bar frames and were superheated, but had round top fireboxes, unlike the earlier Modified Fairlie locomotives which had Belpaire fireboxes.

The only really successful uses of the Fairlie locomotive, other than on the Ffestiniog Railway, were in Mexico New Zealand, and Russia (on the Transcaucasian Railway).

In 1875, seeking additional motive power for the lightly-laid lines of the period, the national Government placed an order with Avonside for six Double Fairlie locomotives that became the E class.

It was the first Double Fairlie locomotive on the Festiniog Railway and the fourth Double Fairlie locomotive to be built.

The most recent double Fairlie locomotives, Earl of Meirioneth and David Lloyd George, were built in 1979 and 1992 respectively in the Ffestiniog's own Boston Lodge works.

A feature of particular interest was his use of the first Fairlie locomotives, Progress and Mountaineer, on the N&BR and of Mountaineer on the ACR.

Locomotive production ceased at the end of 1870 but the Fairlie Engine & Rolling Stock Co. continued as an office for design and for the licensing of Fairlie locomotive manufacture.

The Class FD Modified Fairlie locomotive was designed and built for the South African Railways (SAR) by the North British Locomotive Company (NBL) in 1925.