Take the 57 bus at the Pilar bus terminal. The "Diferencial" one.
Comfortable, will drop you at Pza. Italia where there are plenty of buses and subway. You can sleep in and out of town, It used to depart every 15min fron the entrance of La Rural. Trip took close to an hour from each end to destination.
Must figure out how to get there from your location in Pilar.
Avoid using the train. Too dangerous.
Stopped using it many years ago after almost shooting a group of stoned hoodlums once; seing a guy jerking off jump off the train when a lady screamed. The wanker apparently got tired of using his own hand and pretended to use her's.
I used to work for a few companies at the Parque Ind. for many years and go there weekly. After the incidents described above switched to 57 Dif. Best decision ever.