It's difficult to overlook the Sealink stock, offering as it did a bright splash of colour at a time when the majority of coaching stock was still drab (but smart, except when (often) scruffy) blue and grey.
The Sealink stock was made up of mark 1s, allocated to Polmadie depot. Delving back into the mid eighties (somewhere I can usually be found loitering anyway), there were a number of corridor seconds (SK) in the form of vehicles 18385/369 and 24844/848/856/880/884/890/894/900, and BSKs 35069/070 in the livery. I think that this allowed for two rakes of six carriages (5 x CK plus 1 x BSK), often supplemented by a standard blue and grey BG luggage van.
Photos I have seen show class 47s being typical for traction and 37s not unusual. F'rinstance, see here for a typical formation:
http://www.geograph.org.uk/photo/3308904
And here's a shot of Proto-Pacer haulage on the Irish train, just to prove that anything is possible.

(Although in all honesty, it will have been the railbus that was being hauled).
http://www.geograph.ie/photo/2318080
There's a nice photo here (not mine) of the most part of the Provincial operated, Sealink liveried rolling stock being hauled by a Scotrail branded, Intercity Executive liveried loco on a tour towards the end of its' life that comes with a bit of additional information on the rolling stock:
https://www.flickr.com/photos/blue-diesels/5695784860