Welp, I couldn’t get it to work. At first the ore mines started producing and everything worked fine, but then after two or three deliveries they stopped using the lines and production dropped to zero. I checked total time (as much as I could) and it seems the longest delivery chain from start to finish (from ore to goods delivered to a city) was within 12 minutes. Looks like intermodal transport is not possible, or at least it doesn’t seem to work with any degree of predictability. I’m a very sad panda.