According to scot-rail.co.uk
59201 went to Hunterston and back (via the ECML) on 25th/26th Feb 1998 using the National Power stone hoppers.
5th May 1998 59206 ran north with 17 JMAs via Carlisle and Dumfries as 4Z84 07:14 Milford Junction - Hunterston, and over the next few days it visited Killoch, Knockshinnock and Ravenstruther.
59206 returning home 8th May 1998 working 6Z34 11:22 Mossend - Eggborough Power Station coal (via Millerhill
searching 6-5-98 59206 shows views at Falkland yard & working from Killoch
regards Robert