rabbit
magpie
stream
suitcase
briefcase
newspaper
paperback book
personal stereo/MP3 player
man in a suit
man with a moustache/beard (or a lady!;-))
telegraph pole
types of tree (oak/apple etc)
tractor
Signal showing green
Signal showing amber.
Signal showing double amber.
Signal showing red.
Old-fasioned (semaphore) type of signal in 'up' position.
Old-fashioned (semaphore) type of signal in 'down' position.
Goods train.
'Light' loco. (i.e. engine not attached to a train)
Worker in hi-vis vest
Swimming pool in a garden.
Swing in a garden.
Allotments.
Person working in a field.
Dog.
Person wearing a hat.
Bookstall at station.
Buffet at station.
Boat
Level crossing
I got my children the I-Spy book of train journeys which kept them amused during a long train journey. You can sometimes buy them in tourist information centres.