Regular trash and poop require entirely different methods of handling. I know that Japan uses regular trash to compact and build off-shore islands. Tokyo has a number which may be green areas, parkland and the like before it turns into light development. Kobe, Nagano and other cities have trash incinerators which produce electrical power and year round water parks. Sewage is processed into fertilizer pellets through a sophisticated drying and concentrating process which produces minimal odor.
All the foregoing methods cost more than simply dumping it on the country bumpkins.
I bet those rail cars are really filled with LIB DIM voters.
I thought using human waste for fertilizer was a no no.