sentences:  All told the company produced 142 ploughing engines between 1860 and 1914 when the final pair of engines were completed for a customer in Germany.Early engines were often chain driven but later engines were gear driven speciality order engines for overseas customers.Burrell's experimented with a system whereupon the winding drum was mounted vertically on the boiler, this had the advantage that external stresses placed on the boiler were much reduced over the standard means of mounting the drum on the underside of an engine's boiler.