After I'd written the "Steam on the Western Maryland Scenic Railroad" post here and commented on the sound of a steam whistle echoing across the valley, it got me thinking about other railway sounds that evoke memories with me, like: The 'ting' of signalbox block bells, the 'swish' of the signal wires as they are pulled taught, the 'thump' of the levers in the frame, and the 'creak and rattle' of the semaphore arms as they raise and lower. The drumming of the air compressor after a station stop on old EMUs and Underground trains. The hiss and sizzle of steam escaping on old steam-heated trains. I know everyone has their favourite locomotive sounds, but anyone else find the ancillary sounds of the railway interesting/evocative/memorable ? What are your favourites ?