The Laurin & Klement EN (also known as the 30/35 HP or 35/40 HP) was the successor of the enlarged Type E. The car was only available in 1909 out and was available as an open 4-seater or a sedan.

The water-cooled, side-valve, four-cylinder, four-stroke engine with a T-head had a displacement of 5703 cm³ and a power output of 50 hp (37 kW). This accelerated the car up to 85 km/h. The power was transferred through a gearbox and a drive-shaft to the rear wheels. The chassis of the car consisted of riveted steel U-profile beams.