Hello,
I live on the line and commute daily on the route. There is more varied traffic on the line than is maybe presented and there are plenty of options for scenario creators.
You could download the 'old style' ie 1950's to late 1980's non-corridor stock from UK train sim - HAPs and EPBs were common on the semi-fast rush hour trains down to Portsmouth.
http://www.uktrainsim.com/filelib-direc ... ath=,ty=13Freight trains - From Woking there are stone trains to the West. The down yard (on your right hand side as you enter Woking from Guildford) is a big stone yard. They do a very odd reverse move at Woking to get from the up line, into the down yard, run round, reverse the train into the stone siding, unload and the reverse the move before going back West.
Inter-modal trains - there is a lot of traffic to Southampton that goes via Woking. On occasions I have seen this diverted via Guildford.
Parcels trains - until the mid 1990's there were regular parcels trains from Redhill to Guildford and also from Portsmouth to Guildford - these would then go off to Reading.
There are regular engineering trains working the line south of Guildford and there is a big yard down at Eastleigh where a lot of equipment is kept. The up-yard at Woking is also a big engineering yard. So there are a lot of Ballast, rail trains, tamping equipment etc.
Cross Country trains (used to run from Brighton and Portsmouth via Guildford - then to Reading) - now they just run from Guildford. A class 47 and a rake of MK2 (air conditioned normally about 8-9 cars) later became Virgin trains but often ran in Intercity livery.
Steam services run through Guildford often, and with the Mid Hants railway near by it is common to see engines returning and reversing at Guildford to go to Alton via the Ascot line. A common route is Victoria - Redhill - Guildford - Woking - Waterloo, or sometimes they use Guildford as a way of avoiding the lines out of Paddington to go West. In some cases these trains start from Guildford. They are most common before xmas.
Woking and Guildford used to have more freight traffic, including an O8 as the shunter at Woking. The two little sidings at the south end of platform 1 at Woking used to have 4-5 locos there.
Prior to the 166's being used to the Gatwick-Reading service the dmu of choice was a 3 car 101.
Before the 158/159's were used on the services to Exeter via Woking, the service was class 47 4's and 7's and before that Class 50's. The coaches were old style Mk IIs with the sliding windows.
You also see oil tanker trains - much less common - a regular service used to be via Guildford to North Camp on the line to Reading. Normally a 33 would handle this.
On sundays when there was engineering work these would be sometimes diverted via Guildford.
Other units you used to see in the past - 33s - most recently on engineering trains, 73s on engineering trains, 47s, now you will see 66s and the occasional 59.

In terms of operation - rush hour is the most interesting:
In the morning trains run at 8 minute intervals.
Hope this all helps
Also, Jeremy Gould at railpictures.net has a lot of photos of the area and of the line in the last 1980's early 1990s
http://www.railpictures.net/showphotos.php