Covered vans followed, initially for carrying cattle but later for both general and vulnerable goods too. The first bogie wagons appeared in 1873 for heavy loads, but bogie coal wagons were built in 1904 following on from the large four-wheel coal wagons that had first appeared in 1898. Rated at 20 tons (20.3 tonnes) these were twice the size of typical wagons of the period, but it was not until 1923 that the company invested heavily in coal wagons of this size and the infrastructure necessary for their unloading at their docks; these were known as "Felix Pole" wagons after the GWR's general manager who promoted their use.