Got a better one than that. How about G-5s ten wheelers used as protect engines ? Yup, there they were, fully steamed up and ready to go to protect the schedule. Believe it or not, I never saw one being used. But there they were, protecting the steamer that was hauling us. Now that was reliability.
As a sidelight, I now use Metrolink to commute to Los Angeles. One fine day, things were really late. Finally, the train I wanted, # 317 pulled into the station, and we boarded. On the PA we were told that the train in front of us had a dead locomotive and we were going to pick up its passengers. Sure enough, we were routed to the opposing track, double tracking all the way, and we stopped alongside the dead engine's train. It was EMD F-59PHI # 886, a sorry sight. The passengers quickly got on board and we shoved off, returing to the correct track before we got to the next station. Talk about a crowded train. We had to pick up twice the normal passengers at that station and all of the remaining stations into LAUS. It was SRO, standing room only. The air conditioning was able to handle the load.