I see them all!

I'm puzzled by the spur I see on the Frankston to Stony Point V-Line. I wonder what it is.

Seems to be a separate line, no?
- solid green: Frankston, Werribee and Wiliamstow lines
- split green: Stony Point line
?

On the schematic yes, and that's how it is really,. But on the map I see an orange spur off the orange line going to Stony Point.