LETTER from JAMES S. CLOSE Since 1974 D&H Crash, Errors Often Repeated To the Editor; Your article about retiring Oneonta Fire Chief Pidgeon notes his recounting to you his memories of the D&H Train Disaster of Feb. 12, 1974. You state, “…when a D&H train derailed at Emmons and one of the tankers exploded.” In fact, seven tankers carrying LPG or propane exploded that day – I know, because I was there, and saw the whole thing unfold from start…