Interesting times.

Yesterday we had one of those "Interesting" days at rail. This weekend, the people for Seattle's Special Olympics are arriving for the week's activities, up to 500 per hour were forecast at mid day. Meanwhile, there was a protest going on at the federal detention center near our Angle Lake station, the southernmost end of our alignment, one station south of the airport station.
Before I came on shift, they had been running extra trains to accommodate overloads traveling to the protest and they were parking them for future use.
When the protest was winding down, the police called up informing us that they wanted extra trains for the crowds building at the Angle Lake station. I looked at the cameras for SeaTac Station and noted that all of the trains arriving from Angle Lake were unable to pick up anyone at the airport. Instead of running extras from Angle lake, I decided to turn the extras at the airport and start the extra trips from there. This turned out to be a good thing, as management was monitoring twitter and we were already running extras when they said we were going to.

We've got everything available in service, including a few empty trains to help clear the platform at the airport.

— Sound Transit - 🚆 🚈 🚍 (@SoundTransit) June 30, 2018

I feel good about it.

Here is a representative map of the system as it is now to help you understand the problem we encountered. Map courtesy of Sound Transit.