the units would to my mind be fine with high backed well padded seats which seeing as the WHL fleat is pritty self contained due to tocan block equipment wouldnt be too hard or costly would it?
It is interesting to consider that the precedent for comfort on trains has moved on so far in the last twenty odd years that the original seating fitted to 156s is now often deemed to be uncomfortable. As I recall, in the nineties I was perfectly happy to sit on a 156 for a reasonable amount of time with no complaints about discomfort, though I have never done a journey as long as the entirety of the entire West Highland line on a 156. About an hour and a half would be my usual maximum, which tbh is more the sort of journey length that 156s are best suited for.
Tbh, I'd be happy if all 156s were fitted with the high-backed seating that it fitted to the Northern Spirit refurbished units. I think they're great!
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I know, just 156 related post.
It wasn't that long ago that 156s
were the regular traction on the North Highland Lines,

though you undoubtedly are aware of this already.
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They do plenty of other work, in fact, they go to Carlisle, Stranraer, EK etc also.
That's true, and for the faster, regional routes between large-ish towns, such as the Glasgow & South Western, Stranrear, etc, then I think that in this day and age that 170s would be much better suited to the routes. Hopefully the continuing programme of electrification in the Central Belt will eventually see 170s released to work the likes of the G&SW services.
156s aren't particularly suited to short commuter hops such as Paisley Canal and the East Kilbride lines either, where electrification would be a very good idea.
Nonetheless, I would say that the Highland Lines are very much what 156s are best suited for.
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Some of us still have the pleasure of an occasional couple of 37's up the WHL
Unfortunately, not this week however.
I would have loved to have seen the days of regular class 37/4 plus mark 2 operation on the West Highland line.
Though to be truly honest, I have quite a hankering for a class 29 and some mark 1 compos, taking things back even further...