I continue to play with my dream Sn2 SR&RL plan as I want to locate Bigelow is a location where I could start building the layout. By shifting Bigelow under the South end of Strong and moving Carrabasset to the location vacated by Bigelow, I get much better grades. I’ve worked up a new profile.
Some intermediate locations were left out of the grade profile. But it does indicate that reasonable grades are possible. To add the intermediate locations, I need to decide how long the intermediate sidings should be. Some proposals.
- Strong & Phillips – 12 car trains – 9′ point to point
- Madrid, Salem, Kingfield – 8 car trains – 7′ point to point
- Carrabasset, Reeds, Eustis – 6 car trains – 6′ point to point
Refining the grades results in the following profile. I added flats for Madrid, Salem, and Carrabasset and still the grades do not exceed 1.7%. Many intermediate switching points (such as Reeds, Hammond Field, Kingfield Pit, and Perham Junction) not on the concept diagram would be on grade and would require brakes for switching on the main.
Here is the three levels of this double deck + mushroom plan. Notice that 3 decks exist where Bigelow is on the lowest deck, Strong is the middle deck and Eustis is mushroomed above.
This V2 concept of the double deck + mushroom design solves the most problematic grades from the earlier design by moving Bigelow. The only negative consequence is that operators will not be able to duck under Strong when they arrive off the F&M form Kingfield. But I feel that is a minor negative and can be managed by automating a few of the turnouts and having operators walk around the peninsula. The change gains room for the sawmill at Bigelow and log loading between spurs can be added along the F&M on either side of Carrabasset.
This is the concept I’m going to move forward on.