Out of work, out of luck, and out of favor with his wife, architect Jack Webb retreats to a cottage in Wales to concentrate on a new design project for a friend's business. With the deadline imminent, Jack takes the overnight train from Haverfordwest back to London to deliver his drawings.
On the otherwise deserted train Jack encounters first an unusually friendly guard and then an aloof and otherworldly woman, Hope Cairns, who has just abandoned a planned rendezvous in Milford with a lover, also named Jack. When Hope suddenly disappears, and the guard reveals her story, we discover that Jack's journey is not all it seems. The Railway Siding is a stunningly crafted, highly atmospheric play in one act.