How to use position() in XSLT for looping

I am new to XSLT and I have an XML like so;

<TerminalRoutes>
        <Segment>
            <From>
                <previous>DEN </previous>
                <current>DNV</current>
            </From>
            <From>
                <previous>LAX </previous>
                <current>LAS</current>
            </From>
        </Segment>
        <Segment>
            <To>
                <previous>ATL </previous>
                <current>ATN</current>
            </To>
            <To>
                <previous>JFK</previous>
                <current>LGA </current>
            </To>
        </Segment>
 </TerminalRoutes>

I am trying to transform the XML into HTML using XSLT and I am applying this template

<xsl:template match="TerminalRoutes">
            <tr>
                <td>
                    <b>Terminal Routes</b>
                </td>
                <td>&#160;</td>
                <td>&#160;</td>
            </tr>
            <tr>

            <td>TERMINAL ROUTES FROM</td>
                <td>
                    <xsl:value-of select="Segment/From/previous"></xsl:value-of>
                </td>
                <td>
                    <xsl:value-of select="Segment/From/current"></xsl:value-of>
                </td>
            </tr>
            <tr>
            <td>TERMINAL ROUTES TO</td>
                <td>
                    <xsl:value-of select="Segment/To/previous"></xsl:value-of>
                </td>
                <td>
                    <xsl:value-of select="Segment/To/current"></xsl:value-of>
                </td>
            </tr>
        </xsl:template>

and the resultant HTML gives me the first result set i.e the first "From" and the first "To".

What I want is to re-apply the same template, so I can capture the second result set i.e the second "From" and the second "To". I believe there is a position() function that can be used with but I am not sure how.