Darfield No.1
Built by Hunslet Engine Co., Leeds in 1953, their works number 3783, the loco is a late example of the manufacturers 16 inch inside cylindered, six-coupled saddle tank with the tank not extending over the smokebox. The design pre-dates the rather better known Austerity type from Hunslet.
Darfield No.1, together with a sister, No.2 was supplied new to Darfield Colliery, Wombwell, South Yorkshire. The colliery situated half a mile north west of Wombwell Station on the BR (ex LNER) line.
For the period July 1955 to 1959 No.1 was transferred away to Houghton Main Colliery, Little Houghton. On return to Darfield No.1 worked until sold into preservation in late 1974, initially to a private site in Delph, Lancashire before seeing use on the Yorkshire Dales Railway at Embsay. A move to the Llangollen Railway followed and No.1 sees occasional use there as well as being hired out to other preserved railways, most recently a return to a former home at Embsay. Arrival on hire to Chasewater took place 29-7-2011.
Locally there were three similar locos based at Holly Bank Colliery, Essington before transfer to Littleton, with one of the three later moving on to Granville Colliery near Oakengates, Shropshire.
Darfield No.1 weighs 38 tons in working order.
In the engine shed at Chasewater Railway
Chasewaterstuff's Railway & Canal Blog 
Looking to scratch build a 16 inch in 7mm. I am amazed how difficult it is to find accurate information on the non austerity hunslets. I believe, that from a modelers viewpoint, that they are essentially a stretched version of the 15 inch loco running on 3’9” wheels. The big question is by how much!
If there is any one associated with darfield who has a tape measure I would be most grateful to know:
Length between buffer beams
Distance from front of frames to centre of front wheel
Wheel base
Length of the tank.
Hi David, one of our members did think of building such a model some time ago and thinks that he has the info you require. I’ll let you know as soon as he gets back to me.
Regards, John.(CWS)
Many thanks for the reply. Would you believe it, but after three years of looking I came across a reference on another forum to a drawing in Railway Modeller of September 1972. As luck would have it a kind lady bequeathed her late husband’s complete set of bound Modellers going back over fifty years to our model railway club. I had guestimates a simple drawing using Mike Edges 15 inch kit and a good photo from the internet. This proved to be almost spot on using the dimensions from the magazine article. I had just come in from the workshop having completed the superstructure and once I have saved up for a set of wheels it will look the part in my collection of local colliery locos. I have had the plates for Beatrice for some time now and will finish her as she ran at Acton Hall in 1972.
Again many thanks for the reply.
David.
Hi David, thank you for letting me know. All the best, John D