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Description
The first of the 4-4-2 'Occident' type were built in the late 1870s, building off the 4-4-0 as a premier passenger engine until the 20th century. The Great Central Railway, which was the first rail line that connected the major metropolitan islands of York, Carol, and The Fleet, utilized as their standard passenger puller until the arrival of the 4-6-2.

By that point, the apple green '300' class as the GCR identified them were in the process of rebuilding with more modern appliances. Built in 1897, their original valve gear was replaced by the more modern 'Walcheren' system. The pair of single air pumps were being replaced by a cross-compound one, though not all before 1923. It was a point to superheat all of them as a priority, with a new firebox installed, and a small turbine was installed for lighting.

These improvements were slowed down and stopped due to war in 1914, and whatever improvements that were made were limited due to financial troubles the Great Central Railway ran into before nationalization. Afterward, the program had finished just as attention was being shifted to more modern engines, the reclassified 'D2' being assigned to commuter service.

Their appearance had changed much by this point, including being painted into the more generic black and white trim used on early Oceanic Railways passenger power, eventually using a unique 'OR' livery with red boiler bands.
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Note: The 'D2' was kind of inspired by Pennsylvania RR 4-4-2s, namely the kind of evolution that the class E3 had went through.

Description
The first of the 4-4-2 'Occident' type were built in the late 1870s, building off the 4-4-0 as a premier passenger engine until the 20th century. The Great Central Railway, which was the first rail line that connected the major metropolitan islands of York, Carol, and The Fleet, utilized as their standard passenger puller until the arrival of the 4-6-2.

By that point, the apple green '300' class as the GCR identified them were in the process of rebuilding with more modern appliances. Built in 1897, their original valve gear was replaced by the more modern 'Walcheren' system. The pair of single air pumps were being replaced by a cross-compound one, though not all before 1923. It was a point to superheat all of them as a priority, with a new firebox installed, and a small turbine was installed for lighting.

These improvements were slowed down and stopped due to war in 1914, and whatever improvements that were made were limited due to financial troubles the Great Central Railway ran into before nationalization. Afterward, the program had finished just as attention was being shifted to more modern engines, the reclassified 'D2' being assigned to commuter service.

Their appearance had changed much by this point, including being painted into the more generic black and white trim used on early Oceanic Railways passenger power, eventually using a unique 'OR' livery with red boiler bands.
_____________

Note: The 'D2' was kind of inspired by Pennsylvania RR 4-4-2s, namely the kind of evolution that the class E3 had went through.