DOT-117 tank car rule debuts with controversy

Written by David Thomas, Canadian Contributing Editor

The final spec for the now-official DOT-117 (TC-117 in Canada) non-pressurized tank car adopts the most demanding of the technical requirements first offered for comment in the notice of rulemaking: jacketed and thermally insulated shells of 9/16-inch steel, full-height half-inch-thick head shields, sturdier, re-closeable pressure relief valves and rollover protection for top fittings.

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