By Dr. Troll / Ann Arbor on Monday, August 23, 2004 - 03:14 pm:
I might be able to shed some light on the questions about the tram. Years ago, while at Tech, I was one of the first to operate the "new" tram when it opened for tours, and ran it for a few years. It is built over a new course to take the tours to the East Adit. The top picture above shows the tram that was in place more to the south and west. The current tram is diesel over hydraulic, with 4 hydraulic motors with cogs that meet the center cog rail. The guide wheels that ride on the rails have clamps which ride under the lip of the rail to keep it firmly in place on the grade, while the cog rail is the basis for the movement along the run. As for the braking system...all four cog motors have spring loaded locking devices which deploy to lock the cogs in place. There is also a spring loaded rail clamp brake that grabs the rails in all four corners. Both systems require hydraulic power to keep the brakes off, so in the event of failure, 2 sets of brakes deploy. Either system BY ITSELF can hold the vehicle in place on the steepest grade. Ride with confidence.
Incidently its a UP designed and built project.
By Alex Tiensivu, Georgia on Tuesday, August 24, 2004 - 12:45 am:
I see that now... That is QUITE an illusion! :)