That's what locals are, the last mile (or hundred mile) trains that get made up out of cars that have moved long distances already. Railroads hate thise trains. The money is in unit trains, all one commodity going from one place to one other place over a very long distance - the exact opposite profile of locals. Railroads started making this transition in the 60s and 70s as they shed branches and secondary mains and excellerated into the 80s and 90s by spining off shortlines that would focus on local traffic.