For many years Shell and BP operated a combined distribution network, their wagons being pooled together and carrying both companys' lettering or logos.
This model features a significant detail upgrade on the older oil tank wagon models, with 'generic' design.
Cylindrical tanks were mounted to railway wagon chassis by several methods, the mounting becoming steadily more robust as designs were developed. The anchor mounting uses strong central brackets to connect the tank section with the chassis solebars in the central portion of the chassis between the axles. This design was introduced in the 1930s and a large number of these anchor mounted oil tanks were built before and during WW2 for the air ministry. After WW2 these wagons were sold to the oil companies, so this design of tank wagon formed the primary post-war oil wagon fleet until larger 35 and 45 ton designs appeared in the 1960s.