" The three-twenty train from Glasgow to Ardfillan, the first half of the journey accomplished successfully, had left Overton behind, and traversing the low, dripping, smoke-filled arches of Kilmaheu Tunnel, emerged into the breezy March afternoon with a short, triumphant whistle, that sent a streamer of steam swirling behind the engine like a pennant, and presently began to coast gently down the slight incline of the track, which marked the approach to Levenford Station. "

― A.J. Cronin , Hatter's Castle