Hello Matthew,

I believe this is called controlled collapse.

Usually the first thing to break is the bolts holding the draft gear to the
underframe. Then, as more and more energy needs to be absorbed, more and
more things fail.

Regards,

Glen Mills

On Monday, 16 July 2018 16:46:58 UTC+10, Matthew Geier wrote:
>

> On 16/07/18 16:26, Brian wrote:

> > Similarly, a recent incident in Sydney where an fixed consist 8 car

> > Waratah train set smashed into buffers at speed at Richmond has, I

> > believe, resulted in the whole set being written off. Compression damage

> > was cited as the cause.

>

> snip.....

> That A set crumpled in all the places I expected it would in a head on

> with an 'immovable object'. It appeared there were no intrusions into

> the passenger space.

>

> snip.....

>

>

>