Chiltern ran a very short term plan test special on the evening of Thursday 6th December 2012 in order to ascertain positions of "Loco Stop" signs at Beaconsfield up platform and High Wycombe up and down platforms, prior to the introduction of the new timetable from 10th December 2012 when additional LHCS workings are introduced. This was 5Z67, utilizing the Banbury slam door set, now six coaches all in blue/grey livery and 67018 on the north end, plus DVT. Departing Banbury at 19:35 after working 1U53, it reversed in the down goods loop and crossed to the up goods loop until heading for West Ruislip at 20:12. A stop was made at High Wycombe Platform 3 for measurements to be made and again at Beaconsfield. The train reversed at West Ruislip and is seen here at its stop from 22:06 to 22:16 at High Wycombe Platform 2, on board staff making measurements. Note the "Chiltern Loco S" board on the platform waiting to be fixed at the appropriate point. Digital Image No. GMPI13137.