SPRINGFIELD'S transport upgrade is now complete with the 500-space car park and Centenary Hwy lane extension officially opened.
The $475 million project included adding two lanes on the Centenary Hwy and a train line and two stations, which began operating late last year.
Only 100 car spaces were initially available for commuters during the first months of operation.
Transport Minister Scott Emerson said the spaces were 90% filled by the end of the morning peak hour period.
Trips from the Springfield stations have increased 60% since December, from just shy of 49,000 to more than 79,000 trips in May.
Mr Emerson said the public transport hub had been embraced by commuters.
"As part of our plan for better infrastructure we have increased capacity and improved safety for motorists on the Centenary Hwy," Mr Emerson said yesterday.
"After reviewing the project we were able to include two 5.5km lanes on the Centenary Hwy between the Logan Mwy Interchange and Springfield Parkway, in addition to the Richlands to Springfield train line.
"Motorists have benefited from these additional lanes since they were completed last month and (yesterday) signals the official completion of this major transport infrastructure project."
Mayor Paul Pisasale said council was proud to be able to work with the State Government to deliver 500 car spaces at the Springfield Central station.
"The car parks were completed earlier this year and it is good to see that they are being well used by rail passengers," he said.
Rail commuters can also catch a glimpse of the indigenous artefacts discovered and saved during the construction of the train line, Mr Emerson said.
Around 700 artefacts were discovered near Woodcrest College in late 2011 as construction was set to get under way.
"Passengers at Springfield Central station will now also have a great appreciation of the indigenous heritage of the region, with a display at the station showing replicas of artefacts found during early stages of the rail project.
"The display commemorates the rich history of the Yagara people in the Springfield area and the hundreds of stone tools and other indigenous artefacts found, including a fishing spear, hunting boomerang, stone axe, chisel, dilly bag and 3000-year-old earth oven," he said.