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Thomas Clarkson produced steam buses at Moulsham Works, Chelmsford.
1903 Motor Show Chelmsford Steam Cars exhibited:
as well as Clarkson Burner, with Automatic Regulator, as fitted to Chelmsford Cars by Clarkson and Capel Steam Car Syndicate:
1905 Motor Show: Clarkson showed its latest pattern of steam chassis for double-deck omnibuses fitted with the new automatic semi-flash boiler.
1905 September. Details of their double-deck steam bus.
1910 Annual report in Coventry Archives
1919 the National Steam Car company reached agreement with the LGOC to withdraw from bus operation in London, and steam bus services ceased later that year.
1933 Thomas Clarkson died.