I would have agreed with you, except the mobile users have been waiting since 2012, while T:ane went into production in 2013. they had pleanty of time to port over more steam engines, or more diesels. we just have 3 steamers on mobile; the USRA unlettered 4-8-2, the Union Pacific 4000 class 'big boy' 4-8-8-4, and the CNJ G3s 4-6-2.