Drawing machines, mecha, and armour- those clanky stuff – has never been my strong suit. I looked through so many references of steam trains (while learning the largest steam locomotive is called the Pacific Union Big Boy according to wiki).
What makes it even more difficult is to design the train. Fortunately looking up “fantasy train” helped. I came to the decision that people are unlikely to criticise my lack of engineering knowledge anyway. However, the lack of coal bunkers on this flying train is intentional.