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stanames
It is my understanding that the main steel span of the D&S High Bridge and the Cimarron creek - Black Canyon bridge at one time were two nearly identical Pin-Connected deck truss bridges that were both once standard gauge bridges on the D&RGW but that over time the one on the D&S was strengthened to allow heavier locomotives to go over it.
The weight restriction for the Black Canyon line did not apply specifically to the Cimarron bridge but rather the entire line between Cimarron and Gunnison.
In contrast, heavier engines, (K-27 and K-28) were allowed to operate over the high line bridge, just not allowed to double head over the bridge.
Jimmy