NYMR G2a 49395Grosmont Grosmont

Hmm. Not sure about you reediting operator to NYMR? Built by the London and North Western Railway, which became the LMS railway.

Got it from here: http://en.wikipedia.org/wiki/LNWR_G_Class
"One G2a, LMS 9395, BR number 49395, has survived as part of the National Railway Collection and has been returned to working order thanks to a lot of money from Pete Waterman.[4] It is currently on loan to the North Yorkshire Moors Railway where it runs in BR livery as 49395."