 After raising $ 40 @,@ 000 in donations , volunteers refurbished car 300 and repainted it from the yellow paint scheme it had worn in Portland ( inherited from San Antonio ) to a new red @-@ and @-@ green livery , with " Astoria Riverfront Trolley " lettered along the side , above the windows . To avoid the expense of installing trolley wire and associated support poles and electrical substations , the electric motors of the trolley are powered by a diesel generator mounted on a trailer that the car pulls when westbound and pushes when eastbound , the same arrangement that car 300 had used when running on the Willamette Shore Trolley . 
