8 Straight Rails Gray 4.5v - Set - 7850-1LEGO 7850 1 8 Straight Rails Grey 4. 5 V Trains 8 Straight Rails Grey 4. 5 V (7850 1) is part of the Trains theme, specifically from the 4. 5V 12V subtheme. With 32 pieces and 0 minifigures, this set offers endless hours of building fun. This set was introduced in 1980, making it highly sought after by collectors. This set is used but has been carefully inspected and certified to include all parts, minifigures, stickers, and the original manual. It is