| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | mainline | UK | In the UK, 'mainline' commonly refers to the primary railway routes connecting major cities and towns. | 1 |
| 2 | mainline | UK | In the UK, 'mainline' commonly refers to the main railway lines connecting major cities. | 1 |
| 3 | mainline | United Kingdom | In the United Kingdom, 'mainline' can refer to the major railway lines connecting cities and towns. | 1 |
| 4 | mainline | United Kingdom | In British railways, 'mainline' refers to the principal route connecting major cities and towns. | 1 |