Built by Hudswell Clarke in 1930, No 1643 "Bronllwyd" is an 0-6-0 well tank. The locomotive has two cylinders 6.5 in x 12 in stroke; coupled wheel diameter 23 in; grate area 4 sq. ft; working pressure 160 lb; tractive effort 3,300 lb; weight 6 tons 18 cwt; length 15.5 ft.

Bronllwyd was built for Surrey County Council and used in building the Guildford by-pass. It was then sold to the Penrhyn Slate Quarries in North Wales, from where it was purchased as scrap by Alan Bloom at Bressingham Steam Museum. Later, the boiler from the Kerr Stuart "Stanhope" was acquired and after a complete rebuild it went into service in 1969 on the Nursery line at Bressingham. It has since been completely overhauled again with a new boiler built at Bressingham.

Since entering service at Bressingham, it made a short visit to the Ffestiniog Railway for its 1999 Gala. 2005 saw the first full season that Bronllwyd has ventured away from Bressingham since its arrival there in the 1960s.

The locomotive operated all steam services on the Lynton & Barnstaple Railway for the 2005 summer season and was also used on the railway regularly throughout 2006 and for the first half of 2007. During its last year on the railway, Bronllwyd was fitted with a wooden cab roof, to enable the loco to be used during poor weather conditions.

Bronllwyd’s boiler certificate expired on 9th July 2007, having run its last two days as an open cab loco again. The engine returned to Bressingham Steam Trust in August 2007.