Re: Asking a few questions about early D&RG locomotives

I'm partway through "Little Engines and Big Men", (thanks btw to whoever recommended it), in which Lewis Lathrop recalls a number of small details:
A train from Denver to Pueblo in '81, 7 Jackson & Sharp passenger cars hauled by two 4-4-0's. Early 35' cars weighing 15,000lbs apiece.
4 wheeled freight cars: " Our boxcars and coal cars held 10 tons apiece, and our heaviest engines weighed only about twenty-six tons. They would handle about twenty-five cars at the most." This was likely a Baldwin C16.
He also recalls a monument at the mouth of the tunnel in Toltec Gorge, commemorating 13 persons who died when the last car of a four car passenger train left the rails and fell a thousand feet into Toltec Gorge

Which brings me to a question: Lathrop mentions, in '83, the D&RG bought 30 "giant" new narrow-gauge locomotives from the Grant Works. "weighed thirty tons apiece....with straight topped boilers and deckless cabs." What is a "deckless" cab?

As for "Mountaineer", I know she was a failure in Colorado, but the Fairlies we have in Wales run quite fast, 25mph but could go more, and ride like a coach on the twisty Ffestiniog Rly. Lathrop seems to attribute the difficulty with #101 to one engineer trying to operate two throttles, two reverse levers in one cab. One bogie would work fine, and the other would just spin its wheels