RT-PTA-AR-512B Pack of 5 PTA/JUA Aggregate Tippler Wagons ARC (Inner)Expected Delivery Summer 2026 (Subject to Change at Manufacturer's Discretion). Redpath Dorman Long built PTA box wagons for iron ore traffic in the 1970s. With the decline of iron ore traffic in the early 1980s some of the wagons were purchased by leasing companies for use in limestone aggregate traffic. Foster Yeoman and ARC used fleets of these box wagons for aggregate traffic from the Somerset quarries. The PTAs were built as a mix of outer wagons