The motor, seen it ne above photo, is now covered with a detailed boiler casing.
On the prototype Forney, the boiler/firebox extended through the cab, with the back-head in its end wall.
Here, the casing has been given some details. Most are related to the engineer's side. Since most of the detail will be hidden inside the cab, these will be enough.
From left to right: Tri-cock on the back-head (for determining water level in the boiler), valve and lagged steam pipe for heating the cars. The railroad on Staten Island in the 1800's was very safety minded and did not have stoves in the cars for heat. They also had high level platforms at every station, with access ramps rather than stairs where possible.
Next, steam pressure and vacuum gauges (the Eames vacuum brake was their standard) and top mounted throttle. The vacuum brake stand, reverse lever and piping for the vacuum brake vapor ejector on the cab roof. Other details not likely seen in the enclosed cab were not modeled.