Having managed to loose a lot of my past research during various computer changes through the years, I am going to document it here in order to try and avoid having to do it another time! Now I have no layout to run this on in the works, nor likely to build one any time soon (with Brent in 1947 and my Cameo China Clay layouts a priority).
In the long term I still would like to build a continuous run exhibition layout set in 1998 with a focus on the Devon or Cornwall mainline.

For this the majority of the multiple units will already be built for Wheal Imogen, however the more interesting workings will be far too long to be running on my version of the Newquay branch running across the front of the layout.

All of the below have been verified with photos

Great Western Trains:
Paddington - Penzance Sleeper (shortened)
Penzance: 47813; Mk2d BSO 9481; Mk2d TSO 6200 (ex 7window  First); Mk2e FOt 3520; Mk3a Sleeper; Mk3a Sleeper; Mk3a Sleeper; Mk3a Sleeper (optional for a Friday service); London

Day Time Loco Hauled:
Penzance: 47830; Mk1 BG; Mk2d TSO (7); Mk2d TSO (7); Mk2d TSO (7); Mk2d TSO (8); Mk2d TFO; Mk2d TFO; There was an article in Modern Railway Modelling with a lot more information on these workings, including the alternative formation with a Mk1 RFB. I think one of the Mk2s in this formation is modified with catering facilities, but need to confirm which. All coaches in Intercity 

HST Down
43007 - Intercity TGS, TS, TS, TS, TS, Restaurant , TF, TF   43151 - Intercity

HST up

43168 - GWT, TGS, TS, TS, TS, TS, Restaurant, TF, TF , 43185 - GWT

GWT Sleeper

47813: Mk2D BSO either 9481 or 9492, Mk2D TSO 7 window ex first so 6200,  Mk2E FOt 3520, 3 sleepers (4 for a Friday) and a mk1 full break.

Virgin
HST Virgin Cross Country
43155 Virgin XC; TGS, TS, TS, TS, TS, Buffet, TF, 43157 Virgin

Loco hauled
47817, Mk2d BSO (Virgin), Mk2e TSO Virgin, Mk2e TSO Virgin Mk2e IC, Mk2e virgin, mk2f first buffet virgin

Wales and West

Class 158

Class 150

Class 153

plus I believe I am right in saying there were still a few Class 101 around

South West Trains

Class 159

Pathfinder Gnome Railtours

Railtour Pathfinder Gnome, coaches in Waterman Railways livery

37669 mk2 BSO, mk2 BSO, mk2 TSO, mk2 TSO, mk2 TSO 37403

Pathfinder Gnome Tour

Need to identify what diagram these coaches are.

VSOE Railtour

I have no evidence of it reaching Plymouth in my period (the earliest I have found was circa 2004), however I have a model of the formation in the works and will want to run it.    I havent ironed out the exact formation yet, only the breakdown of coaches that I intend to model.  I have found one potential candidate (if I can identify the coaches) on Flickr. Although I would likley simplify the non pullman end coaches to have a mk1 brake on one end and the mk1 kitchen on the other.   Modelling is initially discussed in this old Blog 

Formation will follow:  

Mail by Rail

TPO

One formation is: Loco: NAA, NTA, NSA, NTA, NSA, NSA (t), NUA, NAA
Another possibility is the Bristol Penzance NFA, NSA, NTA, NSA(t), NFA, NBA, NBA according to the EWS list, although not on Aug 27 1998 as shown here TPO on Flickr

Other Parcels

Workings consist of blocks of either PCV GUV GUV PCV or BG GUV GUV BG, actual formations to be added.

Other

Class 47, Mk1 barrier, ex works mk3, Mk1 barrier

HST powercar, Mk1 Barrier, HST Powercar 

A full copy of the timetable plan will eventually appear here.