In 2002 Marx Trains introduced the Collector Series Boxcars. Each series was to have three roadnames. To encourage buyers to support their dealers, each series was to have a fourth car. The "dealer special" car would have the same litho as one of the other cars in the series, but would be colored differently. This fourth car was to only be available if bought from a dealer. They were also numbered, 1/100 etc. If you asked, they would reserve a number for you for all subsequent series. Mine are all 55/100. In the photos below, the bottom car is the dealer special. Only three series were made. Series one in 2002, series two in 2004 and series three in 2005. Series four was advertised with line drawings of the cars, but they never materialized. Ends up all the litho sheets were printed for series four, but the company folded before ever getting the litho sheets from their vendor. Series four did end up getting produced around 2012 under the name Joe's Trains. When I get time, I will add the pictures for the fourth series.
Steve
COLLECTOR SERIES 1
COLLECTOR SERIES 2
COLLECTOR SERIES 3