It was a concept vehicle that was brought to production in 2006-2007 timeframe. The idea was to have a tracked machine with low ground pressure that could support a number of different platforms. It was never a great selling unit, maybe 200 units were produced. It was called the Scout in development, later changed to SC-50, and later to the ST-50 when ASV changed the logo. In 2008, Terex bought out ASV. It was then changed from yellow body panels to white, but retained the name ST-50. It was eventually pilled from the product listing.
Here are a few pictures of the Scout wit bot conceptual and production options.
https://www.flickr.com/photos/46332771@N03/sets/72157653052586856
Thee is one picture of an RC-60 CTL loading a SC-50 with dirt. I would love to see one of those made in Lego.
Thanks.
Found the *.ldr files. Didn't know what to open them with. Would system would I need to open them?