One question I have begun asking myself is in order for a manufacturer to justify the need to tool a new run of locomotive, or for a new run of rolling stock or other product related to model railroading how many preorders of units of said product are needed to go ahead with tooling?
I learned about this when I started following Rapido Trains Incs newsletters, Q&As and other videos. In one newsletter in which they talked about the CN & CP ten wheeler 4-6-0 steam locomotives, the ones next in line after the Royal Hudson in their icons of steam line.
Jason Shron, the president of Rapido said in last Rapido Q&A said that they where conered at the lack of preorders for the CN H6, which where half of the preorders for the CP D10 ten wheelers. I am guessing this is because we want to see a sample of the D10 and how a smaller HO Rapido steam loco operates, do they will know how the H6 will as well.
They also at one point showed conerned abouit the preorder numbers for Rapidos HO scale Rohr Turbo liner, and how one scheme being the demonstrator only had about eight preorders. I am glad the Rohr Turboliner is a go and the head of the project, Jordon can see his dream come true of seeing this Turboliner being made in HO scale for the first time.
I dont know if my question is something manufacturers can answer due to legal confidentiality laws, but I am hopping for an estimate.
Edit Note as of Friday July 27th, 2020 - I am a bit overwhelmed with all the replies on this thread I started. I will need time to read through them all to reply to some. Thank you for commenting none the less, I do appriciate it.