In message , at 11:39:30 on Mon, 11 Jul
2005, Ed Lake remarked:
If the bomb was dark and oblong (the shape of a boxed bottle of liquor)
or a color that matched the walls or floor of the train and ordinary
looking, he could have slipped it under a seat without attracting much
attention.

Except the trains don't have an "under the seat", in that sense. Some of
the seats have cushions which can be lifted up, but you couldn't do that
without attracting *lots* of attention (and many, perhaps not all) are
fixed in place with cable-ties as part of a years-old security
precaution.
--
Roland Perry