As for your analogy, if a road is closed the reason will virtually always be given, usually it is due to roadworks in which case the closure will be advertised in advance, or a collision. Very rarely it is due to severe weather e.g. snow (in the case of roads at altitude in winter), flooding or downed trees.
It seems when there is a railway problem, some people want to know EVERYTHING as soon as it happened.
On the roads, people seem to accept "The A3 North is closed at Guildford following an accident", and don't demand "The A3 is closed at the hospital junction at Guildford to the A25 junction because a black Peugeot 3008, AB24CDE, hit the OSR quarter of red Nissan Juke, XX70XXX, because the Peugeot driver was sending a text while driving and the Juke driver did not see the problem occuring in their mirror."
Edit to add: "Surrey Police sent these two cars from Guildford, SECAmb sent this DMA based at Chertsey and this SRV based at Guildford, and Westbourne Motors sent this specific recovery vehicle from their depot at... wherever they are based"
The last set of rail disruption I was caught up in was quite large. I got told be staff initially that nothing was going out of the station. Nothing was going to move for a while.
I asked if another specific route would be valid, got told no as that would also be affected as the issue was at XYZ station.
Did I need to know more than that? No.
Once I found out more about what the cause was, did it fundamentally change my travel plan? Also no.
I am not advocating for having no communication, but there is a sensible level.
As others have said, a bogie going on a small adventure is a derailment, but if you ask someone to imagine a derailment, they will say Hatfield, Clapham, Salisbury, Selby, etc and have visions of death, destruction, and days long issues. "A problem in the depot" describes the situation in a balanced way.
On a road example... Picture this: "An incident on the M3 sliproad", and then think about this: "A collision between a coach and a lorry on the M3 motorway".
Now I will say that this hypothetical is a coach doing a 2mph lovetap to the back of an HGV at the lights on a sliproad. Both statements describe the incident, but they are giving different depictions.
The trick is to give as much information as is needed to convey the facts and prevent over speculation, without giving unnecessary or counterproductive information.