This has great potential as a set piece on a preservation-era layout.  I can imagine a locomotive, broken trailer, police cars in attendance, and the curious Great British Public looking on.  And a good way of using up a non-working (or any GWR) loco.

A 65-tonne steam train caused traffic chaos when the lorry transporting it collapsed under its weight and broke the road.

The 95-year-old locomotive was being carried from the Swanage heritage railway, in Dorset, to a steam gala to be hosted by the West Somerset Railway in Taunton.

The low-loader truck had only gone two miles when it buckled under the weight of the former Great Western Railway tank engine.

For more, see here.