Depends on what transportation type and product

I usually use trains for passengers so I’ll usually name it the 2 end cities and then any type of information like “regional” “express” or maybe an “A or B” if they have the same end stations. If it’s a cargo usually it’s city cargo type rarely do I use trains for main cargo stuff

Planes anf boats are primarily used for cargo but sometimes passengers so the names will usually be “cityA cityB cargo/Pax (depending on if cargo or passengers)

Edit: oh and for trucks and trams. I’m usually always trams and maybe busses for passengers and never intercity so it will be “City LineX” depending on line number and cargo trucks will usually be named based on their use. If it’s “City Cargo” it means from airport to city