The locomotive in the Shed is "Graham", ex OIC
The loco outside is "Betty", also ex OIC
The Crimson Lake loco at Long Marsdon is probably "Jean" (also formerly OIC), which is also now at Rocks by Rail (formely The Rutland Railway Museum).
It may interest people to know that "Graham" was originally supplied with vacuum brakes, and additional weights fitted inside the frames to increase traction. The other two locos worked the Quarry lines, while "Graham" worked the "mainline" to the exchange sidings. There is also "Barabel" which is on the Neve Valley, but has had modifications to its bonnet.
All of the nameplates came off the steam locomotives which these Sentinels replaced on the IOC.
Paul A.