I'll show some of my work.
Nature Gas Factory
Why not? Simutrans has 'Gas Tanke', but factory is not. why?
I made this.
(Graphic is from official oil field, gas station... someday, somebody make nice graphics?)
gasPlant provides Gas AND Oil. recently, I heard oil field provides oil and gas.
gasStation and gasModernStation consume gas. but gasModernStation can consume also Gasoline.
GasTanker is bonus. It can transport too much amount of gas. Yes, your freight terminal will be blown up.
Nature Gas is so light, and oil field provides so large amount of gas.
this fact is still remaining, 'I can't transport! TOOOOOOO MANY FREIGHTS!'.
under of two addon need Nature Gas Factory.
Electric Plant Set
Your budgets will be rich.
electricplant is provides Electric Parts from Gas, Stone and Sand. Electric Parts has so high speed bonus, like latest Intel CPU is expensive.
SmallElectricStore is Small Specialty Store like in town.
BigElectricStore consumes Electric Parts and so on.
RedThunder consumes also PrintersInk, Chemicals.
Takumi consumes only ElectricParts.
Sermart is supermarket.
it consumes Gas, Stone, PrintersInk, Moebel, Chemicals, milk, Stahl, Papier, Medicine, fish, meat, food, Plastik and ElectricParts.
Consume amount is not so large.
Fifth Nuclear Fusion Kraftwerk Set
This is so powerful. But difficult is so hard.
YES, another way of electric produce. Nuclear fusion.
NaturalGasProcessingFactory provides HighCompressedIndustrialGas.
HighCompressedIndustrialGas is industrial fuel gas. like distilled water.
FifthGeneration-NuclearFusionkraftwerk provides electric from HighCompressedIndustrialGas.
your transportation must have high speed and large amount transportation.
There are found on Japanese Simutrans Wiki.
Here it is.