I think it is a myth that the Flinders Street Station clocks were ever removed and digital replacements were installed. I have read that the old clocks were removed and digital installed and there was such an outcry that the old clocks were reinstalled.
This is how I remember it. There was a plan to remove the clocks that indicated the departure times on our various suburban train lines and replace them with digital clocks. The clocks had previously been manually adjusted by railway staff with a long pole that presumably turned something in the clocks to adjust them. There was a public outcry and instead the existing clocks were converted to electric operation and adjusted from a central location. It took quite a long time before the converted clocks became reliable indicators. But no, I don't think there were ever digital replacements. If you can give me specifics that they were, please do so.
You can see the clocks at this great post at Melbourne Curious, which again repeats the digital myth. The clocks can be seen clearly about halfway down the page.