In 1981 a group of tankers numbered 14589, 14592-6 were built with the final member of the class (14590) being issued to traffic in 1982. Two of the class 14591 and 14597 were issued as class WJPB on standard gauge bogies. In 1981 WJPB14591 was converted to class JPBA. It was followed in 1986 by the rest of the class. In 1987 14594 and 14595 were converted to standard gauge as class WJPB as was 14592 in 1990.

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