Housed stringer option used where a Cut stringer could have been chosen. The railing sits on top of the stringer and the individual step profile is not visable
This image shows 2 sets of stairs. The stair leading from the top left of the image is partly between two walls at the top. The upper set of stairs terminates at a landing, the landing turns you 90 degrees with the lower set of stairs ending on the basement floor. This is a classic example of  how the railing system works on top of an exposed housed stinger. Notice the shoe mould on top and how the turning detail in the middle of the balusters form a uniform angle as they cascade down the length of the stair. Note the profile of each tread and riser is not visible from the open side, rather one sees a 2 x 12 solid wood face and the railing system positioned a top it. 

1. points to  the interior view of a housed stringer where one can see wood above the line of the tread

2. points to the end of the stairs which is usually about 3" from the last riser. This is important because if space is tight, you need to leave room for this.  If this were a cut stringer then it would have ended behind the last riser.

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Image id: Pickoak1
Railing: #1L
Balusters: turned 1 3/4" Colonial - oak
Posts: turned 3 1/2" Colonial - oak
Stairs: Straight H2S closed rise in oak 1 1/8" tread, 1 1/4" stringer 
@ Finishing Touches -