Strewth!!
That's one helluva fiddle yard 

I've over 700 items of rolling stock so dragging them all up and down depending on temperature is a no go. Had no issues with track, all laid with 0.5mm gap between lengths last summer nothing has moved despite -8 to +50.
One day I will get the wiring finished and start running stock at last

https://www.ngaugeforum.co.uk/SMFN/gallery/160/5079-120726094526-1607962474.jpeg

https://www.ngaugeforum.co.uk/SMFN/gallery/160/5079-120726094522-160795837.jpeg

I don't see anything bizarre about it at all, but we'll leave it at that.

You either experience them or you don't. I'm not sure you can say they're exaggerated, people are literally posting photos of the damage which has resulted from temperature related expansion. Bizarre comment.

I agree with post #1 above.

Here in Australia my layout in the garage experiences large temperature differences, but the effects on the layout are minimal. Keeping track clean is the biggest problem out there.

As @PLD says, I think expansion problems are exaggerated.

It is my unscientific observation that Farish diesel loco gears tend to split more if the layout room is hot. I used to have a lot of problems in NZ summers when my layout was in a shed in the garden.
A lot fewer since we moved house and the layout moved into a room in the house, double glazed and well insulated.

Not too bad here today - I was out on the water training yesterday and today ( Dragon Boat ) - only 30degrees and nicely overcast today ( yesterday was warmer around 32 with direct sunshine ). We have a big race next week in Osaka however the forecast there is still nice and low at 32C. It doesn't really get super hot hear until next month. Last year it got over 41C in several places.

Ooops I underestimated that January day...

Well done England!!  

31 is comfortable, 41 a pain, above that awful.