You've always been looking for a modpack that includes not only tech mods but Pollution of the realms too? This modpack is a good way to go.
Highlight are:
- Mekanism
- Industrial Craft 2
- Immersive Railroading
- Immersive Engeneering
- Techguns
- Pollution of the realms
- MTS Vehicle mod
Nearly all included mods are compatible with Pollution of the realm. That means everything you do will cause pollution. When ever the air becomes too dirty, this will get you in trouble.
It's very easy to play this in survival. Another interesting thing is to manipulate the config of Immersive Railroading. For example, you can decrease the efficiency to about 10%. The Fuels will burn 10 times faster and the pollution will increase by 10 times.
I recommend having at least 16gb of RAM.