7 plank open wagons were the principal wagons used for transporting coal and were standardised by the RCH in 1923. They had a capacity of 12 tons; many were privately owned and carried on in use post nationalisation right into the 1960 s

The Dapol O gauge model of the 7 plank open wagon features:

• Finely moulded body and chassis with internal detail represented
• Opening side doors
• Finely applied livery and printed details
• Profiled wheels and axels with brass bearing pockets
• Metal sprung buffers
• 3 link metal coupling chain with sprung coupling hook