James Watt's critical insights into the condensing steam engine developed in 1765 with the first commercial production of stationary engines in 1775. The first truly portable engine appeared in 1839 and the Steam Traction Locomotive Engines evolved around 1859. Ontario manufacturers Sawyer & Massey, George White, Robert Bell, Thomas Goodison, Waterloo Manufacturing, and .....with production concentrated in Sout Western Ontario.