Signalman
Signalmen were responsible for ensuring that trains were on the correct track and manually operating the levers and signal lights. Some places still employ this profession, so if you’re lucky, you may have seen one here and there. Signalmen oversaw train operations to ensure they were on the proper route.
These specialists were also responsible for ensuring that the train was running properly and arrived on time. In most cases, signalmen have been supplanted by more sophisticated technology and infrastructure.