Don't get too excited, Grahame!

In the case of the West Highland line, this is simply one train a day in each direction will now have one of the converted class 153s (24 extra seats, plus plenty of room for bikes, skis etc.) added. I assume that it is just stations beyond Crianlarich that have been extended where necessary, as south of there (if its anything like the service I used a few years ago) some of the trains will be 4x2 car units, dividing or joining 2 sets of 2 at Crianlarich when the Oban and Fort William services part or join, some of the Oban trains being 2 units. If I recall correctly, the class 156 units are about 150 seaters, so a 300 (or 450 until Crianlarich) seat train to or from Glasgow gets a modest number of extra seats on one trip a day.

On the Kyle line, my recollection from a trip in 1981 was that the trains were 4 coach trains, consisting of Mk1 corridor stock. The seconds would therefore have each held potentially 64 passengers, 32 in the brake coach, but presumably there was either a first class coach (48 in an open coach, 36 if corridor) or a composite (56), so the nominal capacity of each train was between 166 and 220), whereas a class 158 is (I think) 138. However, outside crowded peak commuting trains, 4 people sitting across the bench seat of a second class Mk 1 compartment was unusual (and not that pleasant!), so it was actually more like 156 to 168. It looks like the capacity has actually increased, but presumably at the eastern end at peak times (Inverness commuters?) the trains struggle with the demand.

Did that last train to Kyle you mention in the old 3 out, 2 back service pattern simply return empty to Inverness? I do though recall getting up very early for my trip from Kyle to Inverness in 1981, joining the workers from the Applecross oilrig yard on the Kyle ferry to get to the station from our holiday accommodation on Skye, so it seems unlikely that there was not a train stabled overnight for this service.

My only trip to Kyle was in the early 1980s, I think, and was. both ways, in the Beaver Tail observation car, added to four Mark 1s.