They H sets never had the Tea Cup logo, the started out with the silver stripes and V/Line logo. The first regular runs ran with Ps from memory, however in the early days they often had a T class or just about anything else with a HEP van. Perhaps this was due to a slight mismatch of P class and car set fleet numbers as they were being built.
Also there were some other interesting regular rosters on the Seymour line early on. The up 06:45 out of Seymour would be a P - H set - VVCP van. The van was a dirty freight van that trailed the down 'paper train' the night before, and returned to Melbourne this way. It slowed the P down a bit.
Another one was the Saturday evening 18:30 out of Spencer Street that had a P - H set - DRC - MTH. The motor and trailer were hitching a ride for balancing purposes. Here is a photo by Weston Langford of a similar thing on the Kyneton run-http://www.westonlangford.com/images/photo/116422/
This web page is worth searching for many great 80's Victorian operations. Also Booksvic's Flickr has many useful pics-http://www.flickr.com/photos/60901191@N08/sets/72157631665342890/
He even has some H cars in undercoat!
The 16:30 down Seymour on weeknights would often have an extra big engine leading the P to help an up wheat back from Seymour later in the night. This would result in the train running quite fast and waiting time at stops. Also the Ps that ran the down Seymour evening trains would often help an up goods to Melbourne and be back to Seymour for the morning ups.
Much fun can be had by the modeller running 80's V/Line passengers.