I am a Driver based at Stourbridge Depot I will try to answer the OP's questions. Firstly 67017 has been used for route learning by Chiltern for forthcoming diversions between Leamington and Birmingham New Street this loco leaves SBJ and returns during office hours, it stables and is not run during the evening or night time periods. The two silver sets arrive at approx 20.10 and 21.10 from Kidderminster and are fuelled on arrival, the trains are then stabled for cleaning, at this point the generator set in the DVT should be started to supply ETS to the coaches. The fitting staff arrive at around 22.00 and check over the loco's and trains for defects etc the loco's should then be shut down until prepped in the morning for the 05.20 and 0607departures. The 168's are also fuelled, cleaned and checked and then shut down until the start time agreed by Dudley Council and Chiltern. When the depot opened 10 years ago Chiltern caried out noise reduction work including the instalation of a compressor house and a sound barrier along the length of the depot adjacent to the Stourbridge Town branch. We have been blamed in the past for making noise during freight train diversions, this is actually caused by the stabling of a banking engine beneath the old signal box and the associated moves and shunts connected with it. Chiltern Management have issued noise mitigation instructions and these are posted on the depot notice boards, what more can we do!! this is a working 24/7 MDTR Depot that has been open for 10 years and prior to that was a freight yard going back to the days of Round Oak Steel Works, its been there a long time...