Thanks for helping out, Kim. I think Dave will be grateful for all the input. I was at Laid Back Bikes a while ago measuring the lengths of bikes, with IEP specifically in mind because I am deeply suspicious that they will in fact be hanging bike spaces. I measured all three major dimensions because bike height matters when you turn it vertical, if you don't want rush hour train passengers bashing your carefully aimed mirrors as they pass.
Nazca Fuego (20/26 quasi-lowracer): length 2080mm, width 533mm, height 890mm.
Bacchetta Giro 20 (20/26 stick bike): length 1830mm, width 610mm, height 1145mm.
HPV Spirit (16/20 CLWB): length 1800mm, width 660mm, height 1245mm.
Circe Helios tandem (20/20): length 2160mm, width 585mm, height 1070mm (but obv. varies according to seat height)
Off to measure a Lightning, which generally copes well with hanging bike spaces, and a RANS, which doesn't cope with trains at all…
Lightning P-38 (20/700c): length 1880mm, width 500mm, height 1260mm (or 1150mm if I fold the mirrors down, which I always do if it's hanging)
RANS V2 F26 (26/26 LWB): length 2440mm, width 730mm, height 1230mm
For comparison, the Quest is 2880mm long. Edit: I forgot to mention, for what it's worth, that both my Lightning and RANS have XL frames; a S or XS P-38 is a remarkably little bike.