In the case of the shortline, the call for that extra switch happens between two people who know each other (at least by name and voice) and who have the authority to make the necessary decisions and arrangements themselves on the spot. Try asking for an extra switch on US Thanksgiving with a call centre in Jacksonville or Fort Worth. And just wait until AI invades those call centres......
Those extra switch moves are billed by the shortline at a pretty good rate, too. The economic decision is sometimes whether a plant (especially one running a chemical process or production line) has to be shut down for the rest of the weekend, and then restart.... or can the production continue unabated. Customers don't mind paying a premium to keep things running. That's the underlying cost comparison, not the locomotive fuel and labour bill versus the cost of hiring a trucker.
- Paul