Devs, you have smashed the audio quality hard on Tees valley (just invested in this) and along with NTP line, it's just simply amazing. What I feel it's missing is just 1 simple thing. Cabin doors that squeak and creak. Much like the Hand-break on some engines the like 31 or 45 when you turn the hand-break leaver it squeaks like crazy. You'll have to think about what locomotive's cab doors would squeak and creak worse than others. Some units really show their age well. Very impressed. Thanks for your consideration!