AS some commuters deal with delays following a boom gate strike, TransLink has also warned travellers Eftpos is down across the network, meaning they can't use it to top-up go cards.

An elderly man crashed his car at a boom gate on Arbor St, Ferny Grove, about 7.15am on Wednesday, causing delays of up to 20 minutes for train travellers.

The man, aged in his 70s, was assessed by paramedics at the scene. He was uninjured but "just a bit shocked", a Queensland Police Service spokesman said.

It is not known how the crash occurred.

A Queensland Rail spokeswoman said the crash caused damage to the boom gate and flashing lights.

Delays are expected to continue on the Ferny Grove line.

"We are still receiving advice on how long this might take (before it's resolved)," she said.

Meanwhile, Translink confirmed commuters are unable to use Eftpos at fare machines and ticket office terminals across the entire network.

A technical fail is being blamed for the outage, which started about 8am.

A Translink spokesman said there is an issue with Telstra connectivity, and staff are hoping to have the problem resolved as quickly as possible.

He said passengers can still use cash at stations or can top up online on the Translink website.