The train’s front window was smashed, the truck and trailer lying on its side and the bobcat it had been carrying metres away on the train tracks.
Cars were hit with debris, including a tyre that lodged on a windscreen.
Two females and a teenager were taken to separate hospitals and two toddlers and their mother were checked over at the scene but given the all clear.
9News understands about 100 people were on the train at the time and some were forced to wait an hour to get off, many of them wrapped in blankets.
Shaken passengers said they heard a high-pitched noise and the train shaking.
“He was holding on to me, and I was just like, I was scared, I was shocked,” one passenger said.
Another said he was woken up and bounced off his seat.
A significant police and emergency services presence remained into the night as a crane moved in to begin trying to remove the truck from the tracks.
The Midland line was shut down between Midland and Bassendean, causing delays on the Ellenbrook, Airport and Fremantle lines.
Replacement buses were being organised between Midland and Bassendean but long delays were expected.
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