Train services are mostly back to normal following a "network control" issue that shut down Auckland's network today.

Auckland Transport earlier said trains across the city were delayed or cancelled, with no news on when the service would resume.

It is the second suspension of services this morning.

Earlier today a truck that crashed into a rail overbridge in New Lynn forced the suspension of all trains on the Western line for two hours.

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All trains were cancelled or delayed, Auckland Transport tweeted, as trains could not run over the bridge until it was inspected after the 8am crash.

Rail services were restored just before 10am but delays were expected to continue.

Police were called at 8am to a report of a truck having rolled after hitting an overbridge in Titirangi Rd, a police spokeswoman said.

The driver was transported to Waitakere Hospital with moderate injuries.

The truck, which was carrying a digger, ended up on its side. It is still at the scene with a heavy haulage vehicle on the way to remove it.

"If you are travelling into the city from the west, multiple bus services depart New Lynn into the city," AT said.

"The 18 bus runs every 6 minutes along Great North Road, and the 22 along New North Road."

Scheduled buses are accepting all train tickets and AT HOP cards.

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In 2017 a 10-wheeler truck hit the same overbridge and flipped on its side, also bringing trains to a halt.