Texas Zepher:So you are building this thing. Does the model slide back and forth on its tracks and raise and lower, or does one have to choose a position to build it into statically?
The crane bridge (the bottom half) does have free rotating wheels.
The Ore Sled and larry car have fixed wheels that slide on top of track.
The crane has fixed cogs which fit into track teeth. So to move the crame forward/backwards, you have to lift it up slightly to pull the cog out of the track, then put it back down with the cogs fitting back into the track. It takes a little bit of wiggling to get all the wheels on track, and it's actually a very tight fit.
The boom does go up and down as the ropes are wound on a rotating drum in a wench house at the top back. This shouldn't be hard to motorize.
The jib rotates left and right (yaw)
The bucket does open and close, but it is a VERY loose fit.