I just finished a game using Treefarm (the full mod).

My first observation was that farming wood with MkI farms is excessively effective, in terms of return on setup cost. Even before building the coke chain, you can run your boilers off wood and never need to drill an ounce of coal. I'm not sure ...

I mean: I can think of an belt-elevator, which brings stuff from current level to level 1. Or to be able to generate water-power etc...

It works even with only two or three levels - but if the belt-elevator cost energy to raise stuff, it would make the upper level have characteristics other than ...

(I know these ideas are hardy perennials in and of themselves, but I had an idea as to how they might be usefully combined).

Suppose that a) the map has elevation levels (which can be done in 2D, OpenTTD style) and b) that belts require energy (electric or to be "burner belts") to raise objects up ...

I notice the train is called a diesel locomotive (in English anyway), but it runs on coal rather than a liquid fuel. It would be cool if there were two tiers of train, with a slower steam locomotive first that uses coal, and then the current train becomes fuelled by heavy or light oil (or a mix ...