With 20 locomotives, it will make for an interesting photograph to get all off them in and visible, unless they use the roundhouse tracks ( and I do not think there are 20 around the table anymore). Even then, it will be nose shots rather than broadside views. I guess they could rotate 4-5 at a time somewhere to get better views. The NCTM does not have anything posted as well on their website, I just checked ( as well as NS again).
Currently, the late afternoon / evening shoot is $20 per person, not the $30 Roger mentioned. May have increased the price due to this added feature.