Because that would require either a pilot man from the F&WHR or training WHHR crews to meet the requirements for working on the WHR. Incompatibility of the stock has already been mentioned several times. Also how would you split the revenue? The WHHR are providing the train but they don't build and maintain the railway. What happens if it runs at a loss? Who takes that on? What happens if the WHHR can't provide a loco or train one day for whatever reason and the service is cancelled. Would they compensate the FR for lost potential revenue?