DV&S 50 was the only locomotive used on the railroad from 1954 until some time recently.

C.230 was the only locomotive of the group of four to be scrapped.

The owners discovered this the next morning and took control of the railroad's only locomotive.

The S1 was the only locomotive ever built with a 6-4-4-6 wheel arrangement.

The only other locomotives to use these tenders were the large 9F 2-10-0s.

Number 7 operated as the only locomotive for this company until it folded after 1963.

It was the only locomotive introduced after 1972 to be included in that list.

D5909 was the only locomotive to receive the full "rail blue" livery.

So, the Rocket was the only locomotive to complete the trials.

It is believed to be the only locomotive in the world that has been converted to living space available for rent.