Elderly man critical after being hit by train in Adelaide

An elderly man is in a critical condition after being hit by a train in Adelaide.

Emergency services were called to Ovingham Railway Station, in the city's north, just before 9am, after a man was struck by a passing train at the pedestrian crossing on Devonport Terrace.

The 81-year-old was rushed to Royal Adelaide Hospital, and is in a critical condition.

His wife was with him at the time.

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"The train suddenly stopped and we saw the guy laying down, bleeding," one passenger said.

It's the second incident at the crossing, which due to be upgraded.

There is already work underway.

Warning lights are covered up, and safety gates are not yet in use.

It comes two weeks after a cyclist was hit by a train at a North Adelaide crossing, where works were also underway.

Both incidents happened on the Gawler line, where work continues after a $900 million electrification project.