Trains on the Midland line between Claisebrook and Bassendean are back up and running after an earlier incident forced it to be shut down.

Trains were cancelled on Wednesday afternoon after an incident which required police to attend.

Trains were cancelled for a short time on Wednesday. Credit:Erin Jonasson

At 2pm Transperth released a statement saying replacement buses had been put in place to run between the stations.

The trains were back up and running as normal by about 2.35pm.