You worked with Danny & Bruce Depot Duty Managers (DDMs) then.
Yeah,I was on Bruce's shift.Danny I knew before from The Victoria Line.I think Danny's retired now.
I went on quite a few course's with them and all those brain washing ones so a lot of fluid flowed, I remember when Dave B was the fleet manager we helped him to his room and then went back for more using his room number never questioned it just said when checking out did we drink that much!! All really nice guys.
Previously both the National Rail stock that usually* worked the DC lines and the Bakerloo stock had tripcocks.
These days it may be that National rail stock
has migrated to TPWS as SPAD / overspeed protection while tripcocks have been retained to perform the same function for Underground stock.
Given both protection systems are derived from the same overall signalling system then conflict prevention is maintained even though the actual delivery is different.
* I understand that in the past when the WCML proper was shut south of Watford, British Rail did occasionally use the DC lines to carry diverted WCML traffic (diesel hauled obviously)
On that diversion I think rarely is a better term than occasionally, it was exceedingly rare. To my knowledge there was only one piece of engineering work that caused it to be so used by a handful of trains all 47 hauled/dragged, although IIRC that work was over a very small number of consecutive weekends, not one weekend. I never did it, despite at the time taking big interest in any WCML diversion. I can't now recall what the work was nor the dates, but it was certainly the 47s era, not 25s/31s era with Stonebridge crews that did not know 47s but had in older days handled all such London area work.
I am not aware of any emergency diversions over that route although no doubt there may have been.
While working on the line following a passenger train derailment at Harrow North, I remember an HST passing our site on the Dn DC. It was very useful as we had one of the new kind of managers on site who we did not want to watch us, re-railing a coach bogie the breakdown people had not had time to clear away using a tracked excavator. Quick as a shot the Supervisor looked at the HST sucked his teeth and said I hope he fits through the platforms at Bushey with that. The manager being young and keen almost starts bouncing up and down with excitement and asks if the Supervisor wanted him to go and check. The Supervisor gravely thanks him and says that would be very useful, and the manager departs almost at the run. As soon as he was safely out of sight, we waved the machines over to the bogie, lifted it one end at a time back onto the rails with the machine bucket pushed it clear, and got on with the track relaying.