37601 Class 37-'Fifty' brings up the rear of the 1Z03 09:37 Bristol Temple Meads to Derby RTC Network Rail test train at Chilson 24 March 2016. 37688 Kingmoor TMD is the lead locomotive. The train would shortly come to a stand at Ascott-under-Wychwood, in order to allow the preceding HST to clear the section.