no one used the train until 1829(,) when Stephenson built the Rocket.

[diamondcutter]

Richard Trevithick made the first train in 1803 but no one used the train until 1829 when Stephenson built the Rocket.

Source: Kid’s Box 6, CUP

I’d like to put a comma after the year 1829 to make the when-clause a non-defining relative clause. What do you say?

Richard Trevithick made the first train in 1803 but no one used the train until 1829, when Stephenson built the Rocket.

 

[teechar]

I agree.

 

[Tarheel]

He built the first train in 1803.

 

[Tdol]

used the technology?

 

[Tarheel]

Richard Trevithick built the first operational locomotive. It was used for mining operations.

(Why would you build something and then not use it?)