The discussion on the thread about replacing the stamped-steel coal load on the Legacy PRR S-2 triggered the idea outlined below for a moving coal load. I am interested in any ideas and thoughts, particularly from anyone who has ever seen or built something like this: a coal load that would gradually "empty itself" as the loco ran, then refill (diagrams sort of explaining, below).
And no, I am not going to try to build this. My guess is that I could build a good working version on the fourth try, not before: yes, it's simple but that is what worries me - its bound to be fraught with lots of messy details to get just right. It would take too much time for something I'd like to have but not so much as to devote that much time away from all the other projects I have on my list: this is something I will leave to the manufacters, with their design teams and factory Cad systems. But I would pay good money to buy one that properly engineered and built by a manufacturer. Oh would I!
I'll add that Lionel and MTH might consider that I have bought just about every model steam locomotive on my list now, and have no plans to replace them with newer stuff unless more and better new features come along: swinging bell and whistle steam are good but will not motivate me to buy a Vision Big Boy to replace my JLC Big Boy. But a depleting coal load? Probably. A depleting coal load and moving fireman and engineer figures. Definately.
The idea is a coal load that can telescope and tilt inside the tender.
The manufacturer would offer a compatible animated coaling station. When the loco pulled the tender under the coaling station, accompanied by appropriate local loading sounds, the telescoping coal load would rise to the top: full load.
As the loco runs, the coal load slowly, slowly telescopes down, initially dropping more in front than at the rear, as would normally be the case of a slowly depleting coal load.
Eventually it would reach near empty.
At which point if the loco was not returned to the coaling station, the loco would stop. There would be switches to turn the coaling feature on and off and also control a feature that stopped the loco running if it ran out of fuel. Onboard electronics would vary "fuel use rate" with speed, load, etc.