Long Swing Link/Short Swing Link HST Mk3 bogie differences

[whole diary]

[paul7575]

Further confusion is caused by that quoted text, which says

On the BT10 bogie under the HST^▸ (High Speed Train) coaches the airbags at each end of the bolster support a transverse 'spring plank' into which the pivot pin of the coach is inserted.

The diagram (and other sources) have the swing links supporting the spring plank, on which rest the springs, and then the bolster, which bears the pivot.

Agree.   But I think the useful part of the text is the way the knife edge bearings and their adjustments are described.

Paul

[4064ReadingAbbey]

Paul7755,

There is a slight difference in the lateral ride between the LSL^‡(resolve) and the SSL^▸ (Short Swing Link bogies (125)) BT10 bogies. I first noticed it many years ago when I changed coaches (for reasons now long forgotten) and thought that the second one felt more 'nervous'. It turned out that the 'nervous' one had SSL bogies.

As the ride also depends on the track quality it is difficult to tell the difference between the bogies without a direct comparison and with good quality track the difference is marginal. However in the latter days of BR^▸ (British Rail(ways)) the quality of the Western's track deteriorated and then it was quite easy to tell the difference between the bogies - now it is less so.

There was one other bogie change which has had an effect - one of the first things after privatisation that Great Western Trains did was to start a campaign change for the radius arms (traction rods - item 8 in the drawing) which locate the bogie frame to the bolster as the rubber bushes had become worn. This removed the jerk which was noticeable at the start of braking and also improved the ride back towards the silky smoothness shown when the trains were new.

To cut a long story short - the LSL bogies still give a slightly better lateral ride but on good quality track it is difficult to tell the difference.

[Puffing Billy]

As Michael Jackson said, "Blame it on the bogie"

[6 OF 2 redundant adjunct of unimatrix 01]

I was given the reason for the nmt not visiting the southern main line as that is has LSL^‡(resolve) .... if that is the case does anyone notice a problem with two of its current diagrams

[paul7575]

I was given the reason for the nmt not visiting the southern main line as that is has LSL^‡(resolve) .... if that is the case does anyone notice a problem with two of its current diagrams

Wishful thinking by someone?      Not as regular a visitor here, (unlike the fast main lines such as ECML^▸ (East Coast Main Line), WCML^▸ (West Coast Main Line) and GWML^▸ (Great Western Main Line)), but I've definitely seen it in the Southampton area often enough to realise that it definitely does visit these parts...

Paul

[PhilWakely]

I was given the reason for the nmt not visiting the southern main line as that is has LSL^‡(resolve) .... if that is the case does anyone notice a problem with two of its current diagrams

The NMT runs an Old Oak Common to Salisbury (or Weymouth) via Reading, Basingstoke, Salisbury, Yeovil Junction and Exeter St Davids roughly every 5 weeks on a Thursday and it runs between Basingstoke and Worting Junction) over the third rail.