Britannia motion failure 22/8/23

[cadder toad]

Regarding '1' in the post above. The crosshead is one of the drivers for the piston valve (through the combination lever). If the crosshead is broken then its possible that valve would not be able to release steam from the cylinder at the end of its stroke. Pressure rises in the cylinder, due to the momentum of the loco, and the cylinder relief valve pops, or blows out completely if the pressure rise is too sudden or to great for the relief valve to cope with.

== Doublepost prevention - post automatically merged: 29 Aug 2023 ==

I've seen a picture elsewhere on the web. The crosshead broke at the connection to the piston rod. The crosshead remaining properly attached to the slidebars. So not, 'dropped motion,' which would be more concerning because of the potential consequences.

 

[Deepgreen]

Here's my full 2023 season film of the SSE.

 

[43055]

A family member spotted the front part of the loco in a west bound layby on the A50 near Derby earlier, probably on the way back to Crewe.

 

[12LDA28C]

A family member spotted the front part of the loco in a west bound layby on the A50 near Derby earlier, probably on the way back to Crewe.

The 'front part'? Do you mean the loco, minus the tender?

 

[martinsh]

Seen heading east along Nantwich Road in Crewe at around 4.30pm

 

[43055]

The 'front part'? Do you mean the loco, minus the tender?

Yes just the loco with no tender