Tuesday, March 12. Alpha advises the processor. Thursday, March 14. Alpha calls Beta to check on car's progress. Advised the car missed a connection, so won't be at the interchange until Monday, March 18.
Alpha advises the processor.
Monday, March 18. Shipper faxes release to Alpha on night shift. Wednesday, March 20. Meanwhile, a derailment causes Beta Train PQXR 1234 not to run. As a result, the car misses its intended connec- tion.