regarding the running qualities of the Liberty Lines 600E, I fixed one for a friend recently. A very involved and rather frustrating job to get it right.
The engine uses a rather large 'can' motor and bridge plus a Marx type reversing unit for directional control. He used green LED's for the marker lights on the front.
The motor is mounted on a machined block, which also has details to hold several helical and spur gears to put power to the wheels. All drivers are powered through another set of spur gears on one set of drivers, similar to the LIonel super motor gearing.
He used McCoy Lionel drivers, which as we know, don't hold up so well. With help from Harry Henning, I got a nice new set including his superb job of deflanging the center driver set - they also need to be undercut on the back, which Harry also did a great job of replicating.
A key gear buried in that metal machined block frame had the smallest set screws I ever saw, took a .030 allen wrench to turn. This guy was spinning on axis and is the weak point in the drive train and cannot really be serviced without pulling a set of drivers and the valve gear. Redrilled/tapped the gear for larger set screws.
Was very difficult to get the drive working without some binding on the driver side spur gears. I eventually gave up on the 3rd set and used the siderods to drive the forward axle, eliminating the last set. Very difficult to get good gear to gear contact between the driver and the spur gear set, some variability in all parts including the frame.
After all that, this was absolutely the smoothest running STD gauge engine I have ever seen, just glides down the track and is a joy to see.
It had to have been very time consuming to build these guys. At $730 a pop in 1979, that would be somewhere around $3500 in today's dollars, so not within the reach of most folks collecting STD back then. But it is truly inspiring just to see it and then watch it glide down the rails.
Jim