This is a stock that "rolls" between a support level and a resistance level, and often this pattern repeats many times.
For instance, let's suppose we have the XYZ stock, and it has support at about 50 dollars. As it travels along that support level, eventually buying starts to overcome selling and it starts moving back up. Now let's suppose it runs up to 58 and starts to fall back. We now have support at 50 and resistance at 58. Traders will study that chart, and some interesting things will start to happen. First, as the stock weakens it attracts short sellers who make money if the stock falls. Chart readers see that the stock has support at 50, but it hit resistance at 58 and started falling. They feel they can short it back to around that 50-dollar level, and they actually help drive it down. This is why bounces off resistance levels are often so strong.
As the stock falls toward the support level, those short sellers will start to "cover their shorts," and they do that by buying the stock (a short sale uses "borrowed" stock which must be replaced). So as the stock nears it's normal support level, more and more buying comes from traders covering shorts, along with people who initiate positions simply because it is at support. That often pops the stock off the support level. Once that motion of setting a resistance level and falling back to support is found, thousands of traders can zero in on the stock, creating a rolling stock. As the stock starts back up, all the short sellers become buyers and XYZ gains momentum. As it nears the resistance level of 58, the shorters start selling again and down it goes!
This pattern of running up, banging against resistance and falling back to support can repeat 2, 3, 4 or even 5 times! As the pattern repeats, though, an interesting thing occurs. Usually we see the support level creep a bit higher each time and the resistance level come down a bit each time. Why? Suppose you bought XYZ on it's first run to 58 dollars, and then it tanked. What do you suppose you would do as it nears 58 again? SELL! That is why there is a resistance level- everyone trapped at the high wants to sell as soon as the price gets somewhere close. So we see selling begin at the 57 level. Eventually that becomes the resistance, and soon it is 56. On the other side, we see the support move a bit higher. That is because the short sellers don't want to cover right at support (it may not fall that far), and they buy just ahead of it, say at 51. Soon it will be 52, etc. But you may have had the chance to buy XYZ at 51 and sell it at 56 several times. Likewise, you may have had the opportunity to short it at 57 and cover it at 51 several times. This is a rolling stock.
On the other hand, rolling stock can also be any vehicle that operates on or uses a railway track, including a locomotive, carriage, rail car, rail motor, light rail vehicle, train, tram, light inspection vehicle, road/rail vehicle, trolley, wagon or monorail vehicle.
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