Ah ha and your both right! Come on down!!
The story on the juice shack is it was the original engine house when the Cabin Lake & Western was a smaller railway, at the turn of the century ... the previous one ... then expanded to become a bridge line which hosted power for contract trains ... including the GN and Milwaukee. Then entered into an agreement to provide servicing of the electrics. Which then enabled management to be convinced to convert the old steam shed to the electric shop, and build a new roundhouse and turntable for the big steam beginning to show up on the property.
The smoke jacks are used for testing the steam heat boilers, as Southwest Hi pointed out, and for the occasional running repair of a steamer when space in the roundhouse isn't available and a stall is open in the "juice hog pen".
Now the newly constructed engine service facility will eventually include two electric tracks under cat next to the Juice Shack, three diesel/turbine service tracks with fuel racks between the tracks, a big coaling tower, an ashpit and cinder hoist, new water system including tower and standpipes (that's how we explain away the putty fill lines between some sheets of homoboard that ended up looking like what was done in a local industrial park), and the GM's favorite, a new track behind the to-be constructed division office building upon which to park his private car.
Currently looking at a door/wall enhancement to provide enough clearance to service the Bipolar ...
The work never stops on the CL&W MOW and B&B gangs ...