Set 17840-2
As reported by Frank
Please note: Photos posted are from set owners and may not be totality correct or complete. Some substitution by owners may have occured. I have tried to note any omissions or corrections. Anyone having corrections or additions, please let me know: sdwinter13@yahoo.com.

The set that Frank has is completely different than the set that I have on my spreadsheet. This set is steam and not diesel and the contents are all different. This is what Frank has:
End flap with set number.
Set box top.
Set contents. New York Central 0-4-0 steam switcher, tuscan Union Pacific box car, red Western Maryland hopper car, green Western Pacific bay window caboose, track and transformer.