Sure there is, but people (designers/builders) need to check it. This - sometimes - simply doesn't happen, I can remember at least two similar cases, a "big" o

Sure there is, but people (designers/builders) need to check it. This - sometimes - simply doesn't happen, I can remember at least two similar cases, a "big" one in France: https://www.cnet.com/news/engineers-blamed-as-france-orders-two-thousand-trains-the-wrong-size/ https://www.cnet.com/news/engineers-blamed-as-france-orders-... And a "smaller" in Italy (no English source I can find, sorry): https://www.ferrovieabbandonate.it/linea_dismessa.php?id=226 https://www.ferrovieabbandonate.it/linea_dismessa.php?id=226 https://www.comune.roma.it/PCR/resources/cms/documents/Incontro_pubblico_Ripristino_ValleAureliaVignaClara_01.12.2015.pdf https://www.comune.roma.it/PCR/resources/cms/documents/Incon... basically the tunnel didn't allow enough clearance for a double track in certain points, so a single track was placed (temporarily, for Itala 90 world championship, some 30 years ago, the tunnel was used - with single track - for a few days and then closed, it will probably be reopened in 2022).