I have built quite a few of the Red Caboose O Scale tank cars, I highly recommend the purchase of the Red Caboose tank car weights, Item 48-554 from Scale City Design. The tank car shell is made of two separate segments these weights must be bonded to the bottom tank segment before gluing the two tank shell segments together. I use RTV to bond the weights to the bottom shell segment, also I substitute the plastic brake wheel shaft with brass wire .025 or .032 dia. I also recommend the assembled tank car tank at the bolster locations have the two holes hand tapped for the truck mounting screws before further assembly. The Red Caboose tank car kit compliments the Intermountain tank car kits, both are O scale.
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