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[quote user="MichaelSol"][quote user="Bucyrus"] <p>What does the last column of figures on the right indicate? </p><p>[/quote]</p><p>Those are the hp required to move the train; irrespective of the motive power. As train speed increases, friction, particularly air resistance, increases, requiring more horsepower to overcome the friction. You can see that it is an expensive proposition to move a train at 70 mph.</p><p>[/quote]</p><p>I don't understand the meaning of the last column in relation to the rest of the table.  I thought the table compared two locomotives starting an identical train, accelerating it to 70 mph, and recording the horsepower produced by each locomotive as the speed increased.  However, if it takes 25,927 hp to move the train at 70 mph, then neither locomotive will get it anywhere near 70 mph.  So then what exactly is being compared in the performance of the two locomotives?</p><p>For instance, what is the steam locomotive doing when it is producing 7,677 hp compared to what it is doing when it producing 8,129 hp?</p><p>This is in reference to your table as follows:</p><p> </p><p><table border="0" cellspacing="0" cellpadding="0"><tbody><tr><td>MPH      </td><td>Diesel-electric         </td><td>Steam </td><td>      HP  needed</td></tr><tr><td>5</td><td>    4,278</td><td>1,806</td><td>         307</td></tr><tr><td>10</td><td>    5,133</td><td>3,613</td><td>         743</td></tr><tr><td>15</td><td>    5,600</td><td>4,516</td><td>      1,239</td></tr><tr><td>20</td><td>    5,600</td><td>5,600</td><td>      1,839</td></tr><tr><td>25</td><td>    5,600</td><td>6,323</td><td>      2,562</td></tr><tr><td>30</td><td>    5,600</td><td>7,226</td><td>      3,426</td></tr><tr><td>35</td><td>    5,600</td><td>7,677</td><td>      4,446</td></tr><tr><td>40</td><td>    5,600</td><td>7,948</td><td>      5,641</td></tr><tr><td>45</td><td>    5,600</td><td>8,129</td><td>      7,028</td></tr><tr><td>50</td><td>    5,600</td><td>8,310</td><td>      8,624</td></tr><tr><td>55</td><td>    5,600</td><td>8,400</td><td>     10,447</td></tr><tr><td>60</td><td>    5,600</td><td>8,310</td><td>     12,513</td></tr><tr><td>65</td><td>    5,600</td><td>8,219</td><td>     14,840</td></tr><tr><td>70</td><td>    5,600</td><td>8,129</td><td>     17,445</td></tr></tbody></table></p>
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