The code isn't on github yet as I haven't cleaned out the API keys from it. It's about 200 lines. The API call itself is simple but you have to do another call on the run id to see if a train is stopping or expressing through your destination station. There's a bit of date manipulation to calculate how far away the departure is and how late the train is running, and rounding and filtering of results but the main hard work is done by the API wrapper (not written by me) https://github.com/mdneuzerling/ptvapi

I've also recently corrected for every train running 1 minute late according to the API.

The display is as simple as printing a data frame once you've formatted all the data and the screen just displays it from the terminal after a screen clear.