Lyle Lanley

Lyle Lanley is the one-shot antagonist of the Simpsons episode "Marge vs the Monorail". He is a con artist who sells monorails to multiple towns. They cost a lot of money but he is charismatic enough to convince everyone they are a good investment. They are however purposefully low quality and have broken down and caused accidents, leading to numerous fatalities in other towns. But Lyle is already gone by that point.