How can I slowly make my Coaster system speed up to a specific speed?

Hey, So I’ve asked a similar question before, but didn’t get it working.

https://gyazo.com/4571b4b0aad01805ea6e127026befb73
Let’s say, The green part at the end of the track has a speed of 15, as the blue one at the beginning has a speed of 5.

My question is how can I add it to check each time the speed changes, find the next node along the way with a speed value, and slowly increase/decrease it each node until it reaches that specific node?

Here’s my current code:

Thank you! I desperately need help with this lol.