009 fictional Mallet locomotive

This thing is made for a pair of TU-Koppel A chassis.
Thanks to Nikolisa for making the cab: https://www.thingiverse.com/thing:7048361
WARNING THIS THING HAS NOT BEEN TEST PRINTED!
Built for the Bluewater and Rounders Creek logging Railway in South-west Colorado. The railroad was the only line in America to have their rolling stock fitted with buffers. They were by all means an eccentric railway, with several locomotives fitted with strange features, such as a former steam dummy with its wooden casing removed and a saddle tank added. In 1920 the line was extended up the valley to Peakside Cliffs. Thus a new locomotive was built by Genevieve & co. locomotive works as their custom order Q class given the works number 543 and the name Abomination; the Engine was completed in August and arrived fitted with a type of unique valve gear invented by the Bluewater and Rounders Creek logging Railway's chief mechanical engineer. He had a mechanical stoker (removed three years later due to how faulty it was) and was later fitted with a sand dome.
At first Abomination was out of action after his first run. He warped the lightly laid rails across the line up to Peakside Cliffs and the American coal made his firebars melt. he was quickly fitted with new firebars that could handle the hot burning American coal.

By the mid to late 1940s Abomination had become worn out to a point where the financially struggling railroad was unable to maintain her. Abomination’s rubber steam pipes to his cylinders had grown cracks and he could be seen dragging trains up and down the line enveloped in steam and spraying sparks from his worn out spark arrestor. The unique valve gear proved a maintenance nightmare. Abomination was demoted to be a spare engine by 1952 and was withdrawn around 1955. He was preserved by the Bluewater and Rounders Creek Historic Railway in February 1959.
The railway closed entirely on 5/8/1960 before the section from Bluewater to Rounders creek was reopened in 1970.
Abomination was quickly statically restored and as of 2019 a full overhaul to running condition began; After a hiatus due to the covid pandemic, the restoration continues. Abomination is being fitted with a new boiler and tiers, Abomination is planned to steam again for the first time since 1954 in June 2026.

I mainly made this thing as a joke but decided to do lore for it.