I'm a returning player that hasn't played the game since 2016 and i'm wondering what some of the major changes have been since then. The last change I remember is laser turrets being made, more expensive, 2x2 and stronger

http://imgur.com/1lVN2kz is the link for anyone interested
I do have biters enabled and am using dytech, no nests are visible from that angle though
The trains only cross at 2 points but atleast they havn't crashed yet, i am using rail signals

4 Advanced Refineries
1 Heavy Oil Cracker
1 Lubricant
7 Light Oil Crackers
2 Sulfur Chemical Plants
1 H2SO4 Chemical Plant
2 Plastic Chemical Plants
9+ Advanced Circuit Assemblers
6 Battery Chemical Plants
11 Science 3 Assemblers
5 Processor Unit Assemblers

Not adjusted for Assembler speeds and ...