Complex sentence: The Trust believes that a spritely performance will be delivered through the 17½ "x 26" cylinders, coupled with their modest axle load, it would make this design ideal for today's heritage railways.
Split into simpler sentences: The Trust believes that a spritely performance will be delivered through the 17½ "x 26" cylinders. Coupled with their modest axle load, it would make this design ideal for today's heritage railways.