The class 25 is the perfect loco for NTP and I am quite surprised that it hasn't already been added. It would offer a great variety of services, freight and passenger. With this loco added I think it would really finish NTP off and make it a really immersive experience. The add-on could include the MK1 coach in BR Blue livery and also the BR General Utility Van (GUV) in full blue livery.