Later Newton worked as an engineer, circa 1900, he designed and built the Trans-Andean railway which at the time was the world's highest elevation railroad.

At the beginning of the 20th century, Newton returned to England to become a motor racing driver back home.

[1] In July 1907, Newton won the Century Stakes at the first meeting ever held at Brooklands, attended by 13,500 people.

[2] On 23 September 1908, he won the Monatgu Cup at Brooklands, driving a Napier motor car nicknamed 'The Meteor', after having fought "a terrific duel" with Dario Resta, where their cars "banged wheels at top speed".

In 1908, also at Brooklands, Newton drove a 90 hp Napier for its Australian owner Selwyn Edge, who had a £500 bet with D'Arcy Baker that his car could go faster than Felice Nazzaro's Fiat, but the Napier suffered from mechanical trouble.