4Big Units
The 4Big units were similar to the standard units, but contained a buffet car in place of the intermediate trailer.
These units were also built in two batches. 'Phase 1' units were built in 1965/66, and were numbered 7031-48. 'Phase 2' units were built in 1970, and were numbered 7049-7058.
The 4Big fleet were initially classified as Class 420 by British Rail under the new computer numbering system introduced in 1968, and then Class 422.
Read more about this topic: British Rail Class 421
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