The Digital control unit from Hornby can control up to 60 locos, although not at the same time. It can control 10 locos at the same time and power them too. Although I have not tested this yet.
It costs £99 direct from Hornby, although you can pick it up for £74.99 from Amazon.
Considering that The Cornishman R1160 costs £204 it makes buying it as a set, rather than seperate a sensible choice.