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The U.K's Doctor Yellows. Network Rail test trains

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Editing my latest Cumbrian Coast video the other day which has a few appearances by the Network rail Infrastructure monitoring trains I started to think about the previous times I have caught these in action. Finding them wasn't easy with my filing system as I've described them in different ways over the years and the old 'Ctrl F' button on Excel didn't find them all.


However there was enough to make a video worth while starting with Network rail's own 'Doctor Yellow' a complete HST set converted for the purpose


Seen here at Tapton Junction back in 2010. The power cars were the so-called Surrogate ones fitted with conventional drawgear and buffers




In 2012 I was waiting at Kirkby Stephen on the Settle and Carlisle line waiting for the double headed Black 5s on the Winter Cumbrian Mountain express steam excursion. Snow still lay on the hills and an icy fog was lifting slowly just in time for the test train to appear.




the other sets either use two diesels 'Top and tailed' or one diesel with a DBSO (Driving brake standard open) control car at the other end. In this case two of our Class 37/4s do the honours climbing Lindal Bank on the Furness line




South of the Settle and Carlisle on the Midland railway's Skipton to Leeds line 37 025 blasts through Cononley with a DBSO at the other end.




One of the coaches sounded like it had some serious flatspots on the wheels!





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Video can be found at



The video that set me off on this is a selection of interesting trains that have passed recently including the 8F 2-8-0 48151 on a steam excursion and tampers and ballast trains






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Great pictures and videos!  That scenery at Kirkby Stephen is impressive!

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