Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Railway nationalisation in Argentina
Table title:
Details
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Former company </th><th colspan=1 rowspan=1 > Origin </th><th colspan=1 rowspan=1 > Provinces </th><th colspan=1 rowspan=1 > Railway Division </th></tr>
<tr> <td colspan=1 rowspan=1 > Central Northern (1) </td><td colspan=1 rowspan=1 > Argentine </td><td colspan=1 rowspan=1 > La Rioja, Catamarca, Córdoba, Tucumán, Formosa, Chaco, Santiago del Estero, Salta, Jujuy </td><td colspan=1 rowspan=8 > Belgrano </td></tr>
<tr> <td colspan=1 rowspan=1 > Córdoba North Western </td><td colspan=1 rowspan=1 > British </td><td colspan=1 rowspan=1 > Córdoba </td></tr>
<tr> <td colspan=1 rowspan=1 > Provincial de Buenos Aires </td><td colspan=1 rowspan=1 > Argentine </td><td colspan=1 rowspan=1 > Buenos Aires </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Provincial de Santa Fe </td><td class="highlighted"  colspan=1 rowspan=1 > French </td><td colspan=1 rowspan=1 > Santa Fe, Chaco, Córdoba </td></tr>
<tr> <td colspan=1 rowspan=1 > Midland </td><td colspan=1 rowspan=1 > British </td><td colspan=1 rowspan=1 > Buenos Aires </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Compañía General de Buenos Aires </td><td class="highlighted"  colspan=1 rowspan=1 > French </td><td colspan=1 rowspan=1 > Buenos Aires, Santa Fe </td></tr>
<tr> <td colspan=1 rowspan=1 > Córdoba Central </td><td colspan=1 rowspan=1 > British </td><td colspan=1 rowspan=1 > Santa Fe, Córdoba, Santiago del Estero </td></tr>
<tr> <td colspan=1 rowspan=1 > Transandine </td><td colspan=1 rowspan=1 > Argentine </td><td colspan=1 rowspan=1 > Mendoza </td></tr>
<tr> <td colspan=1 rowspan=1 > Central Argentine (2) </td><td colspan=1 rowspan=1 > British </td><td colspan=1 rowspan=1 > Buenos Aires, Santa Fe, Córdoba, Sgo. del Estero, Tucumán </td><td colspan=1 rowspan=1 > Mitre </td></tr>
<tr> <td colspan=1 rowspan=1 > Buenos Aires Central </td><td colspan=1 rowspan=1 > Argentine </td><td colspan=1 rowspan=1 > Buenos Aires, Santa Fe </td><td colspan=1 rowspan=4 > Urquiza </td></tr>
<tr> <td colspan=1 rowspan=1 > Entre Ríos (3) </td><td colspan=1 rowspan=1 > British </td><td colspan=1 rowspan=1 > Entre Ríos </td></tr>
<tr> <td colspan=1 rowspan=1 > Argentine North Eastern (4) </td><td colspan=1 rowspan=1 > British </td><td colspan=1 rowspan=1 > Entre Ríos, Corrientes, Misiones </td></tr>
<tr> <td colspan=1 rowspan=1 > Corrientes Economic </td><td colspan=1 rowspan=1 > Argentine </td><td colspan=1 rowspan=1 > Corrientes Province </td></tr>
<tr> <td colspan=1 rowspan=1 > Great Southern (5) </td><td colspan=1 rowspan=1 > British </td><td colspan=1 rowspan=1 > Buenos Aires, La Pampa, Río Negro, Neuquén </td><td colspan=1 rowspan=4 > Roca </td></tr>
<tr> <td colspan=1 rowspan=1 > Patagonian </td><td colspan=1 rowspan=1 > Argentine </td><td colspan=1 rowspan=1 > Río Negro, Neuquén, Chubut, Santa Cruz </td></tr>
<tr> <td colspan=1 rowspan=1 > Central Chubut </td><td colspan=1 rowspan=1 > British </td><td colspan=1 rowspan=1 > Chubut </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Rosario and Pto. Belgrano </td><td class="highlighted"  colspan=1 rowspan=1 > French </td><td colspan=1 rowspan=1 > Santa Fe, Buenos Aires </td></tr>
<tr> <td colspan=1 rowspan=1 > BA & Pacific (6) </td><td colspan=1 rowspan=1 > British </td><td colspan=1 rowspan=1 > Buenos Aires, Santa Fe, Córdoba, Mendoza, San Luis </td><td colspan=1 rowspan=2 > San Martín </td></tr>
<tr> <td colspan=1 rowspan=1 > Andean </td><td colspan=1 rowspan=1 > Argentine </td><td colspan=1 rowspan=1 > Córdoba, Mendoza, San Luis, San Juan </td></tr>
<tr> <td colspan=1 rowspan=1 > BA Western </td><td colspan=1 rowspan=1 > British (7) </td><td colspan=1 rowspan=1 > Buenos Aires, La Pampa, Córdoba, San Luis, Mendoza </td><td colspan=1 rowspan=1 > Sarmiento </td></tr>
</table>
Question:
Which are the French-owned railway companies that became nationalised? 
Answer:
The three French-owned railway companies which were nationalised are the broad gauge Rosario & Puerto Belgrano and the metre gauge Compañía General de Buenos Aires and Provincial de Santa Fe.