Among the first of the duties which fell to Isaac Dodds was designing the railway's first engine "The Cutler". While up to that time, locomotive boilers had been fastened rigidly to the frames, Dodds fastened it at the front only, allowing for movement with expansion at the firebox end. Whether this locomotive was built by him, or whether the railway itself built any, is unclear, though Dodds left in 1842 to set up in business on his own. Certainly, at that time, demand may have been outstripping supply.