WATCH: Sparks Fly On Melbourne Train

It happened near Flinders Street.

WATCH: Sparks Fly On Melbourne Train

It's believed exploding power line connectors are to blame for a dramatic burst of sparks which shot from the roof of a train in Melbourne's CBD. 

The roof of the first carriage of the train on the Sandrington line lit up at 7:21am and again about 20 minutes later.

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A Metro spokeswoman told Fox FM despite initial fears from passengers the carriage was never on fire - while the MFB was called out but not required. 

Delays of about 45 minutes are expected throughout the morning. 

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