Is it the test route not functioning or is the trains being tested not functioning 100%? Again it's all speculation, all I know is, as I said above, we always have power apart from when it's off due to pre-planned isolations.(
Of which there are quite a lot!!!!)
As for West Ealing Sidings (or to give it its posh name West Ealing Light Maintenance Depot

) the first units went in there last Thu night / Friday Morning.
The 387s will be out at some stage!! (
Edit: There are now STP paths in for several trips in the early hours of Sunday 5th Feb Reading TCD - Didcot - Reading TCD
Talking of 387s there is a delivery of 1 unit to Reading TCD planned for Friday 3rd Feb and another unit on Monday 6th Feb.
Fri: 7X35 09:30 Bletchley TMD - Reading TCD 12:56
Presume it will be
387142 / 143.