The next major improvement came with Richard Trevithick's high pressure engines.
Trevithick obtained his high-pressure engine patent in 1802,[28]
and Evans had made several working models before then.
The first locomotive was built by Trevithick and was constructed for Coalbrookdale Ironworks in the UK.
Stephenson wasn't the
first to design a realistic steam engine(that is credited to Richard Trevithick in 1804.).
Unlike Watt and Newcomen's atmospheric engines, Trevithick's engines used steam to power the engine, not just
to create a vacuum.
Shortly after Watt's patent expired in 1800, Richard Trevithick and, separately, Oliver Evans in 1801[24][27]
introduced engines using high-pressure steam;
Trevithick visited the Newcastle area later in 1804
and the colliery railways in north-east England became the leading centre for experimentation and development of steam locomotives.
The first experimental road going steam powered vehicles were built in the late 18th century,
but it was not until after Richard Trevithick had developed the use of high-pressure steam, around 1800, that mobile
steam engines became a practical proposition.
The first real experimental steam powered cars were built in the late 18th and 19th centuries,
but it was not until after Richard Trevithick had developed the use of high-pressure steam, around 1800, that
mobile steam engines became a practical proposition.