Re: High walkways, Low walkways, Platforms... on Tank cars

Anthony Thompson <thompson@...>

Richard Brennan wrote:
Browsing through Kaminski's AC&F Centennial History book . . .
and the first with a modern (or should that be moderne?) tank-top
operating platform is dated 1934 .
. . . why was there such a long
transition period to the now universal top platform design? It
appears that cars without platforms were built well into the late
1950s... Was it simply buyer preference... or was there a change in
AAR or DOT regulations?
I am not sure why you think platforms are more "modern." As I understand it, they are just a reflection of what a buyer orders. Before World War II there were not very many tank cars in chemical service, and so the need for access to specialized valves and fittings did not exist. This is described and illustrated in Kaminski's book on AC&F tank cars.

Tony Thompson Editor, Signature Press, Berkeley, CA
2906 Forest Ave., Berkeley, CA 94705
(510) 540-6538; fax, (510) 540-1937; e-mail,
Publishers of books on railroad history

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