There are previous threads re: Cornelius/Enos BRAIN etc and whether the BRAINS' of Ruardean are related

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Gloucestershire County Council....

19th century Tramway known as Brain's tramway, from Trafalgar Coliery to Bilson and Drybrook.

Brain's tramway, running from Trafalgar Colliery to Drybrook via Steam Mills and Nailbridge.

Trafalagar Colliery was linked to the tramroad network in 1860 and was served by a tramway, built by Cornelius BRAIN c1862 leading to the Bilston sidings. etc etc.

Peter,
off top of my head I don't know which Cornelius Brain (there were a few in the Ruardean area at this time), but around 1840 one of them was owner/manager of the Trafalgar pit and also a few others nearby such as Royal Forester (Speech House) and Rose In Hand which became part of Trafalgar.
History of all these can be found here;
http://lightmoor.co.uk/forestcoal/Coalopen.html

Thank you to all those who have replied so far, here are some more facts:

The parish records available on this site indicate that Cornelius married Sophia Bennett on 22 September 1831 at Hempstead, Gloucester. They are the parents of Thomas Bennett Brain, who was baptised on 20 October 1833 at Ruardean Congregational Church. Thomas Bennett was the owner of the Euroclydon and also Trafalgar Colliery.

Trafalgar colliery near Cinderford, which was in production in 1860, was developed by the Brain family and was the only large mine in the coalfield run by free miners in the later 19th century. The colliery, which in 1882 became the first in England to have electric pumps, took over the workings of Strip And At It colliery to the north, and a short tramroad through a tunnel connected the pitheads. See https://www.british-history.ac.uk/vch/glos/vol5/pp326-354.

The Ross Gazette, dated Thursday 2 December 1869 records the following:
THE LATE CORNELIUS BRAIN, Esq. - Our obituary records the death of one of our esteemed coal proprietors, Cornelius Brain, Esq., a gentleman deservedly respected and beloved in the Forest of Dean, and by all who had the privilege of his acquaintance. For the last two or three years his declining health and extreme bodily affliction has been borne by him with Christian firmness and resignation to the divine will. He had on the 24th ultimo attained the age of 65, and on the following morning expired at the Quabbs, Drybrook. His absence will be deeply felt. It may be truly said of him that he was a kind master, a firm friend, and a genuine Christian. His remains were interred in the burial ground of the Independent chapel, Mitcheldean, on Tuesday, the 30th November, and on Sunday morning next, the Rev. J. Lander intends his discourse to have special reference to the solemn event.

Details of the Will:
Surname Forename Role Relationship Year
ADAMS Francis Hamp Beneficiary Friend 1870
BRAIN Cornelius John Beneficiary Grandson 1870
BRAIN Thomas Bennett Executor Son 1870
BRAIN William Blanch Executor Son 1870
BRAIN Sophia Beneficiary Wife 1870
WILCOX William Witness 1870
ROOTES William Rudge Witness 1870
BRAIN Alfred James Probate Extract 1870
ADAMS Sarah Elizabeth Hamp Beneficiary 1870