Balcombe would see these as the main traction on fasts (which wouldn't stop!)

http://semgorgu.ipower.com/gallery/6pul_1.html as well as Brighton Belles.

Semi fasts and stoppers would be

http://semgorgu.ipower.com/gallery/4lav.html and http://semgorgu.ipower.com/gallery/2bil_01.html

Whilst Newhaven boat trains and freights would be either steam-hauled or with Bulleid's CC1/2 and 20003 Booster electrics such as (first two pictures, actually in Balcombe yard):

http://semgorgu.ipower.com/electric/class70_1.html