Bulgarian State Railways locomotives 142–150

The supervising engineers and construction companies contracted to build Bulgaria's first railway were all British[3] and after the opening of the line in 1866 an order was placed for 10 new British-built locomotives to supplement the original fleet.

Bulgaria declared independence on 5 October 1908[5] and this led to restructuring within BDŽ, as part of which the English-built locomotives were again renumbered, this time in the sequence 142–150.

[4] The reduction of sequential numbering from 10 to 9 resulted from the loss of original locomotive 12, which had been dismantled in 1873 as a source of spare parts for the other engines.

It is currently on display at the main location of the National Transport Museum at the original 1866 Ruse railway station.

Bulgarian State Railways also operates a fleet of Class 87 electric locomotives built at British Rail Engineering Limited at Crewe Works, although these were supplied second-hand after original service in the United Kingdom.