This wonderful sandwich has stood me in good stead on many journeys. Indeed, it fed one of my editors and his wife all the way to Rome. It comes from a charming book by T. Earle Welby, The Dinner Knell (Methuen 1932). It is a great standby on British Rail where the buffet is temperamental to say the least. I always carry my own food and drink, together with ice and napkins.