Where did you go?

How do people disappear
out of sight
somewhat
out of mind
until brought to light
in death and loss.
Where did you go
when I wasn't watching?
On to the tracks,
wandering aimlessly
tripping over planks
and pebbles
which cut
and graze - and suddenly
you're gone
in the breeze
of a passing train,
headlights and all
and there isn't a sign
you were once there,
just a memory
so distant
so abstract
that we can't cry,
but just stand
gaping
in disbelief.