Original sentence: However, the Union Pacific Railroad company recently had problems with the Eugene rail yard
Edited sentence: By adding oxidization sensors to all the engines on their trains, they are researching the best way to make their engines production of green house gases decrease.However, the Union Pacific Railing company recently had problems with the Eugene Rail yard.Recently they have begun testing their fuel emissions in the air.The EPA were allowed to test the engines before and after testing just to add authenticity to the results.The contamination is mostly petroleum hydrocarbons, industrial solvents, and metals.The trains derailed and spilled oil all over the areas of Colorado and Utah water supply.There has been contamination that began forming over one hundred years ago.They claim that they are the most environmentally friendly  railroad system in the country by saying how much more fuel friendly they are than other railroad services.They were also sued in the amount of $800,000 due to environmental problems.This has effected a nearby groundwater source