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| | Railway Magazine Volumes 1 to 19 |
 | | This gives an extensive account of the Welwyn Tunnel accident which was attended by Johnson and by Seymour Clarke, General Manager, who lived in Hatfield. |
 | | Illus.: Kerstelen viaduct, avalanche being cleared on 30 March 1888, plan of loops, north portal of tunnel, corridor 2nd class coach interior, 4-6-0 on express passing Schwyz. |
 | | He arrived home, in Barnet, as black as a sweep, but the brickwork to the tunnel was only slightly damaged. |
| www.steamindex.com /rlymag/rm1on.htm (637 words) |
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