Hello John, your e-mail through the Engine Shed Society website 
has been forwarded to me to answer.
Wirksworth engine shed opened 1 October 1867 and housed locomotives 
working the branch passenger services and also the considerable stone 
traffic. However, it closed for locomotive use in 1900,
when engines were sent out on a daily basis from Derby. The engine shed 
was adapted for goods use, which continued until the late 1960s at least. 
When the building was demolished has yet to be determined.
 
You are correct in assuming the "small roof" running along the ridge of 
the main roof was for ventilation purposes. Such roof vents have had 
several appellations, usually dependent upon the railway that constructed 
them: clerestory, ridge vent, central vent etc., come to mind.
 
Here are two pictures from my private collection, which you are welcome 
to use if you wish; just credit them to my collection; no fee required. 
The picture taken from the rear clearly shows the two small building 
extensions, one of which would have been the shed office/mess room the 
other would have been for stores and a workshop for minor repairs. 
The chimney would have served the sand-drying furnace inside the shed 
and also, probably as a flue for a coal fire in the office and possibly 
a small forge in the repair shop. The two lines of rail inside the shed 
would have been provided with inspection pits between the rails for 
fire cleaning, oiling around and repairs etc.
 
Lastly, when opened the shed was provided with coaling facilities - type 
and location unknown - a water tank and 42 foot diameter turntable that 
were both sited at the rear of the building, close by the bridge from 
which the rear view of the shed was taken. Coaling would have ended in 
1900 but the tank and turntable remained in use for visiting locomotives; 
both are visible on the OS 1955 edition, but the turntable had gone by 
the time of the 1968 OS with the engine shed and tank still in situ.
 
I hope all this is of assistance to you - best wishes and thank you for 
your interest.
 
Roger Griffiths 
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