https://marspedia.org/index.php?action=history&feed=atom&title=Talk%3ARailroadTalk:Railroad - Revision history2026-04-23T12:30:55ZRevision history for this page on the wikiMediaWiki 1.34.2https://marspedia.org/index.php?title=Talk:Railroad&diff=129606&oldid=prevMichel Lamontagne at 12:37, 21 April 20192019-04-21T12:37:15Z<p></p>
<table class="diff diff-contentalign-left" data-mw="interface">
<col class="diff-marker" />
<col class="diff-content" />
<col class="diff-marker" />
<col class="diff-content" />
<tr class="diff-title" lang="en">
<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 12:37, 21 April 2019</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td>
<td colspan="2" class="diff-lineno">Line 1:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>One of the questions is friction. Railroads can only travel up very low grades, and this should be even worse on Mars. As F=uN, u being a property of materials remains the same, but N is reduced by the lower gravity. N is a form, and F=ma. m in invariant, but a, the acceleration is proportional to gravity.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>One of the questions is friction. Railroads can only travel up very low grades, and this should be even worse on Mars. As F=uN, u being a property of materials remains the same, but N is reduced by the lower gravity. N is a form, and F=ma. m in invariant, but a, the acceleration is proportional to gravity.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>So trains will have less roll resistance and can be larger, but will have trouble going up steep grades.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>So trains will have less roll resistance and can be larger, but will have trouble going up steep grades.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Air resistance is scarcely a factor, so the two main elements in a train movement will be roll resistance and acceleration up to moving speed. If regenerative braking can be used, then the main factor would be reduced to roll resistance, as stopping the train would return the energy that was used to accelerate it.</ins></div></td></tr>
<!-- diff cache key marspediaorg_www-mwmars_:diff::1.12:old-129605:rev-129606 -->
</table>Michel Lamontagnehttps://marspedia.org/index.php?title=Talk:Railroad&diff=129605&oldid=prevMichel Lamontagne: Created page with "One of the questions is friction. Railroads can only travel up very low grades, and this should be even worse on Mars. As F=uN, u being a property of materials remains the s..."2019-04-21T12:34:44Z<p>Created page with "One of the questions is friction. Railroads can only travel up very low grades, and this should be even worse on Mars. As F=uN, u being a property of materials remains the s..."</p>
<p><b>New page</b></p><div>One of the questions is friction. Railroads can only travel up very low grades, and this should be even worse on Mars. As F=uN, u being a property of materials remains the same, but N is reduced by the lower gravity. N is a form, and F=ma. m in invariant, but a, the acceleration is proportional to gravity.<br />
So trains will have less roll resistance and can be larger, but will have trouble going up steep grades.</div>Michel Lamontagne