Knowledge, of a question and an answer.

Q. Where shall we go?

A. To the railway.

So to the railway they went, and as soon as they started for the
railway they saw where the garden had hidden itself. It was right
behind the stables, and it had a high wall all round.

"Oh, never mind about the garden now!" cried Peter. "Mother told me
this morning where it was. It'll keep till to-morrow. Let's get to
the railway."

The way to the railway was all down hill over smooth, short turf
with here and there furze bushes and grey and yellow rocks sticking
out like candied peel from the top of a cake.

The way ended in a steep run and a wooden fence--and there was the
railway with the shining metals and the telegraph wires and posts
and signals.

They all climbed on to the top of the fence, and then suddenly there
was a rumbling sound that made them look along the line to the
right, where the dark mouth of a tunnel opened itself in the face of
a rocky cliff; next moment a train had rushed out of the tunnel with
a shriek and a snort, and had slid noisily past them. They felt the
rush of its passing, and the pebbles on the line jumped and rattled
under it as it went by.