They must make themselves familiar with the "tariff-book," which tells them how much a boy must charge for going from any one place in the city to any other. They must learn the use of the different kinds of tickets, on which the temporary record of their service is kept. They must know when to charge for a car or stage fare and when it is proper for them to walk.
This is so much to learn as a young boy, especially with having to learn the locations of streets. I was surprised to hear that telegraph boys had to attend trade school, but it definitely makes sense knowing everything that they have to learn and do. It really is a specialty filled with many different details, along with a lot of physical labor.