 The order consisted of 88 SLE variants, numbered 10646–10733, were constructed with thirteen bedrooms each, and 120 SLEP variants, numbered 10500–10619 constructed with twelve bedrooms with the last compartment used for an attendant.The Mark 3 air-conditioned sleeping cars were introduced including many additional safety features that had been lacking in the Mark 1 carriages that had caught fire at Taunton.The Night Riviera stock was the first on the route fitted with controlled emission toilets.