What is the job of the Capitol people on the train?

There are people on the train to cater to tributes like Katniss an Peta. Effie Trinket is a Capitol-appointed escort for the Games. Haymitch Abernathy one of the two sole District 12 citizens to have won the Hunger Games, and the only one surviving. As such, he serves as a mentor to his district's tributes. Venia, Flavius, and Octavia are Katniss's prep team for the Games, responsible for making her presentable (hygiene, make-up, etc.). T