Original sentence: In 1901, the New Zealand Railways Department designed and ordered the Q class, the first locomotives in the world to employ the 4-6-2 wheel arrangement, an arrangement that went on to become one of the world's most popular and prolific types and was named "Pacific" in honour of its origins.In 1908, a heavier, more powerful locomotive was required to haul traffic on the newly completed mountainous central section of the North Island Main Trunk Railway, and as a logical progression of the 4-6-2 design, the 4-8-2 wheel arrangement was created for the X class.The NZR X class was a pioneering class of eighteen steam locomotives designed by A
Edited sentence: In 1908, a heavy and powerful locomotive was required to haul traffic on the newly completed mountainous central section of the North Island Main Trunk Railway, and as a logical progression of the 4-6-2 Q class design, the 4-8-2 wheel arrangement was created for the X class.The NZR X class was a pioneering class of eighteen 4-8-2 steam locomotives designed by A