The car went through a number of changes in seating arrangements and door types (and post-76, internal partitions), with seated capacity ranging from 70 to 90 (73 being the most commonly quoted figure) and 164–175 standing passengers in crush load conditions. Initially the vehicle featured three sets of double-leaf sliding doors per side, with 2 windows either end and 6 windows between each set of doors. Later, the outer sliding doors were singled, and an additional window was added to the centre section for a 2-D-7-DD-7-D-2 configuration.