Why not Three, all though if it is going to be used in freshly fallen snow rather than packed snow one engine might be enough to push it all, but one more engine might be need to pull the extra bodies that will be riding along from the pass down through Los Pinos valley and on in to Osier and the eastern terminus, unless it starts on the east side, then they will need to ride at the begining. It would be tough to chase a Rotary through three foot of freshly fallen snow in an off road vehicle or a Truck. Better start planning to get my snow machine in working condition
Still a Student,
Dave