Merging items with different health: Please do not. Could you instead add a mechanic to allow pocket repairs? Maybe it's a module in the armor, maybe it's a research that just enables the capability, but rather than potentially losing items because of picking them up unfixed, allow them to be fixed ...

Fluid Train: Is there a link to the explanation of "why"? In absence of that, would someone experienced explain it to me? A cargo wagon holds 30 items, barrels stack to 10, and hold 25 units of oil. So a cargo wagon holds 7,500 oil. A single chest, at 48 stacks, is even better for holding ...