Discover and read the best of Twitter Threads about #PettsWood
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⚠️⚡️ Were so sorry for the disruption to @Se_Railway + @TLRailUK passengers on the Orpington/Charing Cross line this morning - this is the problem right here, at #PettsWood. It’s a “blown insulated block joint”, although actually two of them have gone. /1 
You can see the blocked lines just outside #PettsWood as they have BLOC in their train indicators. We’re able to run on the other 2 lines and the connecting loops at the bottom of the picture, which is why there is still a train service, albeit not a normal one. /2
An insulated block joint is used to separate 2 track circuits, which use electric currents in the rails to tell us where trains are. This is one in happier times. /3
