Ed, I do not know the modeler of the cable car unfortunately.
For good photos of NH cable cars see Shoreliner 39-2:15,16,17.
Noch #14202 makes three different sized spools (3.5',4.25' and 5.5') with two spools of each size per package .
Kibri #9921 also makes different sized spools. Both, I believe, are out of production but can be found on Ebay.
I found the Noch spools on Ebay but delivered cost me $9.35 a package.
You could also use Evergreen Scale Plastic 3" or larger scribed siding for the spool ends.
Then use an appropriate sized cut dowel for the center section. Jim Warner