Instrumentation for running tests with Brecknell Willis MK.II pan tographs (continuation to IMIS 419 Dec. 1977) Old Dalby test track Feb. 1978- March 1978 (IM-IS-426)

To monitor the performance of the MRKII (variable parameter) Pantograph whilst running under the newly erected trolley wire overhead line equipment at the Old Dalby Test Track.