GA do this with their Liverpool Street services in the peaks, with some of the trains also continuing to run as a shuttle between Cambridge and Ely before departing to London, or after arriving from London, depending on direction. Which makes it all the more strange that they're (potentially, if RTT is correct) cancelling one of those shuttles from December.How about not bothering with another unit between Ely and Cambridge and run a Ely to Kings Cross or Liverpool Street instead of terminating at Cambridge