Just an additional comment about two of many subtle things that were captured . . .
In O Gauge Railroading's DVD Great Layout Adventures, Volume 8, Rich Melvin interviews Hot Water about his railroad, and also about his experience in firing large steam engines. At one point Hot Water is describing the difference between firing a coal-fired engine vs an oil burner, and the requirement that the Fireman be responsive to adjusting the burner in tune with throttle changes by the Engineer.
Hot describes how Doyle McCormack uses the air horn valve to create a couple of quick "psst-psst" sounds in the cab, to get the Fireman's attention, as Doyle is preparing to increase or reduce throttle.
These audible signals are heard at least twice during the Daylight Express video, as is the exhaust from the No.8 automatic brake valve on the 4449 as Doyle moves the handle to Service and back to Lap while making small reductions while approaching a station stop.
