This is understood and appreciated in a general sense - having worked in a role involving real-time, safety-related, operations myself.
However, for the specifics of what happened to the passengers on 1A66, the defective train was moved and line block removed before 1A66 arrived at Peterborough - having been delayed north of the station for some time and then moving forward signal by signal as trains in front were able to move. By reference to OpenTraintimes website, when 1A66 joined the queue, there was something like 9 or 10 trains queuing between the defective train and 1A66.
From joining the queue of trains to arriving at Peterborough was somewhere between 40 mins and 1 hour. So there was, in fact, time (at least in theory, of course practice and theory may not agree!) to plan what to do with the passengers on this train. That plan, whatever it was, patently failed. Should whichever organisation(s) responsible for real-time operation planning not have enough staff on duty, or short notice call-out, to cope, then that organisation has simply 'planned to fail' in such circumstances - after all, trains and infrastructure such as signals are not 100% reliable/available, and therefore it is entirely forseeable that, from time to time, one will fail away from a station and cause, on a busy route, a large backlog to be sorted out.
All I'm after is knowing why passengers on 1A66 had to change trains 3 times before onwards movement from Peterborough was possible.The reasons can hardly be regarded as a state secret, so its not an unreasonable aspiration - I'm certainly not intending to ask for action to be taken against individuals once I do know. As result of what passengers on 1A66 had to do, my travelling partner (they hold a disabled railcard) was in significant physical distress - not that any rail staff dealing with passengers from 1A66/1E20/1E21 seemed to have any consideration for anyone who might have a disability and the impact changing trains 3 times might have on them.
I'm not expecting anyone on here to disclose it if they think their job could be at risk. Maybe those on here who say, in effect 'I know, but I'm not telling you' (for whatever reason) might like to reflect on the reaction of someone receiving that information - will it pacify them or raise suspicions?. If the latter, then perhaps it might be better to stay silent -if only because such a response adds nothing to what is publically available.
I'll get to the bottom of it somehow - FOI requests to Network Rail and LNER (operator of Peterborough station) about it (especially as my travelling parner has a disability and was in some physical distress as a result of having to do 3 changes of train) will be filed before long.