Thank you for all the replies, it seems the following sums up the pic?
With a Z in its headcode denoting perhaps a test train, New AL6 electric E3167 (86228) is thought to be passing Halton Junction as it works a Freightliner from Liverpool, Garston sometime in May 1965. During April 1965 extensive familiarisation trials were carried out with 15 wagon sets of the new freightliner vehicles carrying empty containers mainly between Liverpool and Manchester to Willesden with electric locos being replaced by diesels at Rugby. Behind the loco is thought to be Dynameter car No. 45050 designed by the Lancashire & Yorkshire Railway’s Chief Mechanical Engineer George Hughes and built by the company in 1912. At that time the Unions and BR were in dispute regarding guards riding in the rear cab of the locomotive and the ex-L&Y Dynamometer Car LMS No.1, 45050 was utilised solely as a guard’s van on these trains from April to December 1965, no recordings were taken. ADDITIONAL INFORMATION BY VIC SMITH, PIC BY THE LATE COLIN WHITFIELD/RAILPHOTOPRINTS