I agree with the find and fix as you have spelt it out. Fusible plugs (plus safety valves) are about the only 'fail safe' items that I can think of on steam.
Says a lot for the accreditation/registration process where the difference between 'bearings' and what are, in effect, 'roller bearing bushings' is not recognised.It's a different world now, with current generation diesel locos having automatic fail-safes on their fail-safes. Steam locos belong to an era when you could probably limp home with even a major fault using things like fencing wire.
Steam: Three minutes to find the fault and three days to fix it.
Diesel: Three days to find the fault and three minutes to fix it!
Fault finding may have improved with computer control...
The only automatic "fail-safe" I can think of on a steam loco are the fusible plugs. Any others?
Given the apparent lack of experience in SOME areas of preservation and SOME accreditation authorities being a 'tick in a box' arrangement it is surely all the more important for all concerned to know precisely what is being ticked off on the one hand and have realistic knowledge as to how likely it is to be true on the other. For these reasons it is vital that correct, uniform and universally accepted terminology is used and understood by all concerned.
Accreditation should be more than shuffling paper and shifting blame/covering one's behind.
Much of that saying in steam days was on steam, an hour to find the fault, and a day to fix, diesel a day to find the fault, and hour to fix.
It was more a general saying than in reality though. There are a huge number of ways both steam and diesels could die on you. Yes lack of steam, and not always because of poor firing skills either, as there was some loco's that were notorious for going well for a while and then would lay down on you, all on the same trip, then they would pick themselves up and go well, I know one 36cl that had that reputation, and was glad to see it set aside, as everytime I worked it, you could count on having a good half a trip to Goulburn and the other half, a nightmare and long night ahead at some point in the one trip.
Why did many of the single phase air pumps have the top of them fully dented on the main cover? easy to know when they ceased working and you had to go out on the footplate to whack that part of the pump with the coal pick to get it started again, especially on saturated loco's. Failed dynamo's in some districts meant the engine was not allowed to work over many areas.
A diesel was a failure when you got 3 ground relays in succession, you had to time the first one, and when reset, then each subsequent relay, drop out and reset. On the third you stopped and contacted the nearest depot and mechanical staff.
As with steam, a compressor failure often meant you went nowhere.
One thing common with both for an engine failure was if the whistle/air horn was not operating. Safety of the public in areas arounf the rail lines, unless in a double, or MU, where the engines would be reversed and failed one goes in the shafts, unless the 2nd engine had a fault and could not lead, often happened.