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The most numerous wagons with over 300,000 produced by BR, the 16t mineral wagon.
Used to replace the myriad wagons of the big 4 and private owners and it was based off an LMS design.
The majority of these wagons were built only with handbrakes and continued clogging up the system with their allowed maximum speed (25mph).
The design had to fit within the constraints of colliery loading/unloading bays and they had no vacuum or air brakes as disconnecting the brake pipes was seen as a big hindrance.
Coal trains on the Great Central's London Extension in BR days were run at far higher speeds due to the lack of traffic on the line and shallow gradients, making control of the train far easier.
