simon wrote:
4tph wimbledon-edgware road-whitechapel
2tph wimbledon-edgware road-upminster
2tph olympia-edgware road-upminster
8tph edgware road-tower hill-upminster

Don't forget all of these would need to be 'C' stock which has a
reduced capacity compared to 'D' stock. (and are there enough 'C'
trains?)