Alex Seal

Bristol East Signal Box

General Railway Signal Co. Ltd.

"an American company whose British work was done in connection with Metropolitan Vickers Electric Co. Ltd., trading as Metropolitan Vickers GRS Ltd."

The Signal Box: A Pictorial History and Guide to Designs
The Signalling Study Group
Hardcover: 248 pages (June 23, 1986)
Publisher: Oxford Publishing Company
ISBN: 0860932249