Good video, thanks! I have the same model but I just could not live with the integrally moulded handrails so I removed them and added brass stanchions and 0.3mm brass wire rails. Extra work but it looks good.
Some remarks on this kit! It is not really a new one, since many years before It was build by or for Revell, it was available from Monogramm. I have build those, even with motorization, and you could choose different american companies, not only Union Pacifik, but I must admit that I have no idea where this kit was created first! Those other kits that are shown on the back of the package were peoduced prior to this kit! There is an anouncement that the kit of the German locomotive of Baureihe 01 will be produced again, but I have no idea, if this is still true. Fact is that I haven't seen them yet!
What locomotive is this Japanese one? Never seen that one before. Also Big Boy I think might be the largest ever made in the world and was functional. Baldwin Locomotive Works made a pretty impressive sized one but was barely able to function.