So a five coach Mk 3 rake (including two power cars, so roughly 140 metres) has more seats than a four coach Voyager (roughly 90 metres)?
That's not very surprising.
But the HST is 1.555 times longer than the voyager, however has 1.57 times the seats. So even with a two power cars, it is as effici9ent in its use of space. (and you dont have to sit on a cummins engine )