After ten months' labor, George Stephenson's locomotive "Blucher" was completed and tested on the Cillingwood Railway on July 25, 1814. The track was an uphill trek of four hundred and fifty feet. George Stephenson's engine hauled eight loaded coal wagons weighing thirty tons, at about four miles an hour. This was the first steam engined powered locomotive to run on a railroad and it was the most successful working steam engine that had ever been constructed up to this period, this encouraged the inventor make further experiments. In all, Stephenson built sixteen different engines.