The strain on infrastructure in Melbourne's booming outer west is in the spotlight once again, amid concerns its newest train station may reach capacity within 24 hours of opening.

V/Line services at Caroline Springs will begin operating on Sunday, with trains every 30 minutes during peak hour through the week.

Melton Council's mayor said the station had been a long time coming, but the 350-space car park was expected to reach capacity on Monday morning.

"I think the car park will be full by about 7:30am," Sophie Ramsey said.

"The City of Melton is a growth corridor, and we're going to have hundreds of thousands more people coming into this corridor."

But grassland home to a critically endangered shrub called spiny rice flower surrounds the station, making it difficult for the car park to expand.

It could be relocated, but that is extremely costly.

"I'd be looking at lobbying to get a high-rise car park," Cr Ramsey said.

V/Line to monitor passenger numbers as population increases

Native grassland around the station is protected, making expansion difficult. ( ABC News: Jessica Longbottom )

Unlike many other stations, where drivers can park in the streets surrounding the station, Caroline Springs is isolated.

The only option is to travel to another station or go home and return on the bus.

V/Line acknowledged concerns the station may quickly reach capacity during peak times and said it would monitor patronage numbers.

"We think we're going to be OK," chief executive James Pinder said.

"People can be strange creatures sometimes and understanding their habits is not always easy ahead of time but we've done our homework.

"Originally it was going to be one platform, a single line. We've taken the opportunity to future-proof it as much as we can."

Trains will be 'chock-a-block' before reaching Caroline Springs

But despite capacity concerns, the long-awaited station has been welcomed by locals sick of travelling to congested stations such as Deer Park.

The station is also serviced by bus routes and has bicycle storage.

John and Heather Facciolo are worried they may not get a seat on the train. ( ABC News )

"For Caroline Springs, it means they've finally got the station they've wanted for a very long time," Mr Pinder said.

Ambarish Harn said he was close enough to ride his bike and leave the car at home.

"I'll be using it from Monday; I've been looking forward to it for a long time. I'm glad it's finally here. I'm pretty fortunate I live nearby," he said.

"A lot of locals travel to nearby stations like Deer Park and Keilor Plains."

Heather Facciolo said the facilities looked good but she was concerned about capacity.

"They say the trains are full when they come from Melton, so I don't know how anybody will get a seat," Ms Facciolo said.

"Let's hope there's enough train space for us. We normally catch buses into the city, so we'll give it a try next week," said her husband, John.

"We'll catch the bus, we wouldn't bring the car here. I don't think it's big enough. [The others in the area] are all chock-a-block by 8:00am and this one looks smaller."