The CXB class sheep trucks were the final class of four-wheeled sheep truck built for the W.A.G.R. They used the post-war standard 18'-0" chassis and the extra 2'-0" in length increased the capacity by 14 sheep over the CX and CXA classes. It seems a little odd that they were not given a two-letter classification as most of the C group classes remained unused.

All three hundred wagons (17401-17700) were built in 1953 by Hoskins Engineering. The decline in live sheep traffic meant that by 1960 some wagons were surplus and available for conversion. Disposal of the class was as follows:

 1960

17403/4, 17445, 17498, 17513, 17535, 17543, 17556, 17576, 17599, 17633, 17695 to NF 22801-22812 

 1961

17451, 17653 written off 

 1962

17517, 17553, 17621 to NC 22751-3

 1963

17666 written off

 1965

17418, 17430, 17449, 17455, 17460, 17564, 17636, 17697 written off

 1971

17684 written off

 1972

17539 written off

 1976

17442, 17688, 17692 written off

 1979

17407, 17412/9, 17427, 17431, 17448, 17452/9, 17461, 17470/5/6, 17482, 17490/3/4, 17505/6, 17510/1/9, 17525/8, 17531, 17541/5/9, 17557, 17578, 17584/6/8, 17595, 17620/9, 17631/9, 17647, 17651/4, 17665, 17696 written off

1980

17527, 17607, 17648 written off

1981

17472, 17483, 17507, 17597, 17649, 17667 written off

1983

17401, 17415/7, 17420/8, 17440/7, 17456/7, 17463, 17477, 17485, 17491/5, 17503, 17518, 17533/4/6/8, 17542/6, 17554, 17560/7, 17570/2-4, 17581, 17591/6, 17605/8, 17610/5, 17622, 17637, 17641/3, 17662, 17673/4/7, 17683/7, 17690 written off

1985

17402/5/6/8/9, 17410/1/3/4/6, 17421-6/9, 17432-4/6/7/9, 17441/3/4/6, 17450/3/4/8, 17462/4-7/9, 17471/8/9, 17480/1/6-8, 17492/6/7/9, 17500-2/4/8/9, 17512/4-6, 17520/4/6/9, 17530/7, 17540/4/7, 17550/8/9, 17562/3/5/6/8/9, 17577, 17582/5/7/9, 17590/2-4/8, 17600/2-4/9, 17611-4/6-9, 17623/5-8, 17630/2/4/8, 17642/4-6, 17650/2/5-9, 17660/3/4/8/9, 17670/2/5/6/8, 17680-2/5/6, 17693/4/8, 17700 written off

1986

17435, 17468, 17474, 17484/9, 17521-3, 17532, 17551/2, 17571/9, 17580/3, 17624 written off

1987

17473, 17555, 17561, 17635, 17640, 17671/9 written off

Nine wagons unaccounted for! (17438, 17548, 17575, 17601/6, 17661, 17689, 17691, 17699)