UPDATE: You'll have seen plenty of coverage of this picture today and yesterday, showing the derailed train at #Tonbridge. Here's a brief overview of where we are and what we are doing, also why @Se_Railway are affected even though it's not their train... /1

This picture shows clearly the cables cut when the low-speed derailment happened yesterday, in sidings off the line to Redhill. The cut cables mean those sidings are completely "dead" and trains can't move. That includes @Se_Railway trains, which are trapped without power. /2

Our colleagues @Se_Railway are running as many trains as they can on the Tonbridge/Charing Cross services but there will be some cancellations as some of those trains are usually formed of stock trapped in the sidings today. Please check with them for travel details /3

The line to Redhill (on the left of this picture) is now open but trains will finish early tonight and be replaced by buses so we can turn the power off and get this train back on the tracks. Please follow @SouthernRailUK to see how your journey will be affected. /4

Incidentally, when we have the power off on the live rail, we make sure we test it and monitor it using these orange units, called STCRIDs (Self Testing Current Rail Indicator Device). If it starts flashing, the power is on... /5

When the train derailed it also damaged some troughing routes, where our signalling cables sit. Luckily, those cables were undamaged so it's just the power cables that need to be replaced. /6

So, tonight a crew from @DBCargoUK will rerail the train under the watchful eyes of @SouthernRailUK derailment manager. Meanwhile, our electrical team will swing into action and fix the power lines (more of the damage in this picture). Please do check with @SouthernRailUK... /7

... as trains will finish early. We did work together to try and get this sorted last night but as time ran out to get the electrical people on site, and the ground conditions proved challenging for the rerailing team, we decided to focus on getting the Redhill route open. /8

Finally, many people have (understandably) asked if the track was to blame. It's not our place to say much on that, except that at this point it appears that the track was not at fault.
Thank you for reading and please check before you travel. ENDS.