I have had a railking erie berk pull 35 to 40.And that the couplers start to pop open from the stress.I have had my railking ps2 up to 46 boxcars.But what i have is a mix of rolling stock.For me the key is to spread the weight.Runing a long train can be very tricky to.But i have fun with it.Its funny how these o gauge train can sometimes act like there real world counterparts.
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