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I can't speak from experience with locomotives, but I can as a diesel mechanic. The electronic controls on today's engines allow them to run more efficiently and make more power because they are monitored so closely and manged so well. The electronics on commercial equipement is not the same as a consumer level device, diagnostic parameters are far more descriptive. Options like "snapshot" are available, where a list of parameters can be selected, and when a certain value is reached, a snapshot is taken. Individual parameters can be selected, and an alarm selected for a given value. Preset diagnostic routines, automatic cycling of engine rpm, cylinder cutout can be selected. All of these things help in diagnosing a problem. <br /> <br />Systems are designed for failure. Parameters can be set to limit rpm or power in the event of some failure in a "ramp down" or a "shut down" mode. If there is some failure of electronics the unit can operate in a "limp mode" for a preset period of time, and if a unit is in an application where it is absolutly necessary to avoid any shutdown, this can be overridden temporarily or programmed. <br /> <br />All this said, there are still failures that cannot be shown by any diagnostic system, and for that, there is no substitute for a working knowledge of the equipement.(you still have to be a gearhead)
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