Do you have a name or date?
See the site below, especially the Miscellaneous section concerning Family Research:
http://www.greatwesternrailway.com/The National Railway Museum:
http://www.nrm.org.uk/html/home_pb/menu.aspTheir online book collection should be ready summer 2005 - so you might just have to wait a little while!
They do hold: Railway House Journals are another potential source of personal information, many of which are held in the NRM Library and which are summarised below: Great Western Railway 1887 - 1947
An alternative to Kew is STEAM the dedicated GWR museum (with archive) at Swindon:
http://www.steam-museum.org.uk/heritage/steam/steam-archiveintroduction.htmAlso try ringing or writing to:
Great Western Railway Museum
The Old Railway Station
Off Old Station Way
Coleford
Gloucestershire
GR16 7LD
Tel: +44 (0) 1594 - 833569
Fax: +44 (0) 1594 - 832032
Good hunting,
Geoff.