The overhead 'Pantograph' chargers at Gravesend are now in use, which I believe happened earlier in December. As such, there is now a significantly increased number of ie trams on service B, and interworked E.
IE37 is seen leaving the stop at Bluewater showing the unusual destination blind with (Temple Hill) in brackets, and what look to be some extremely small via points, whilst IE30 is seen showing a rather innovative blind at Gravesend Bus Hub, showing the chargers in use. It appears that passengers are not allowed on board whilst the vehicle is charging, so this seems a "smart" way of explaining what is going on, rather than just being parked "Not in Service".
Both pictures taken on an overcast Saturday 27th.
Chris