ActuallySmall green tank engines can turn up just about anywhere, eg in your wellies/toilet/larder, so you always need to keep an eye out for them.
(
nicey,
Mon 5 Nov 2001, 6:56,
archived)
do you reckonit could be one of those making my pipes clank at night?
(
AndyK,
Mon 5 Nov 2001, 7:00,
archived)