Assign random color to all created transport lines.
Available on Steam Workshop :: TransportLineColorMod
Default colors
I have used Distinct Colors Generator to create default color set, but if you are not happy with it feel feel to create your own.
TransportLineColorMod will check colors.txt file in %USERPROFILE%\AppData\Local\Colossal Order\Cities_Skylines\Addons\Mods\TransportLineColorMod directory and use its content as source for random colors. If custom color file doesn't exist default colors will be used.
Example colors.txt file
#d40000, #bed400, #00d42a, #0094d4, #5500d4, #d4006a