They did Lanarks on occasion filling in for 318/320s when those services originally were changed to operate from Central High Level. Would sometimes work there due to failures or wider disruption. As Glasgow Central and Motherwell Link 2 drivers both signed the units, there was no issue with traction knowledge. Although not the greatest on a route of that distance they were better than no train at all.
I see. I thought some of the Glasgow via Kings Park to Newton were extended to Lanark.