block train
noun1
Rail transport, Railways, Transport A freight train that carries only one commodity.
- Steel billet traffic in block trains from Briton Ferry to Langley Green has developed from an initial service of one train three times a week [...]. In addition, plans are now being formulated for the operation of numerous block trains formed exclusively of the new 32.4-ton BR brake-fitted hopper wagons, permanently coupled, from South Wales collieries to Swansea Docks, [...].1964 March, “News and Comment: More block trains in South Wales”, in Modern Railways, page 152: