About Us Steam Locomotives BR Standard 4MT 4-6-0 No. 75029 “The Green Knight” BR Standard 4MT 4-6-0 No. 75029 “The Green Knight” 75029 was constructed at Swindon and appeared in May 1954. The class is a larger version of the 76xxx 2-6-0 Moguls and, more to the point, a tender version of the Standard 4 2-6-4 tank engines. Designed for mixed traffic duties on routes where their predecessors, the LMS ‘Black 5s’ would be too heavy for. Currently at Grosmont out of service for repairs.