| Inglés | Español | |
|---|---|---|
| Engineering | ||
| Engineering | spring rail | carril de muelle [m] |
| Inglés | Español | |
|---|---|---|
| Technical | ||
| Technical | spring-rail frog | sapo con riel de muelle MX |
| Technical | spring-rail frog | rana con carril de muelle |
| Railway | ||
| Railway | hinged spring-rail frog | corazón con carril de muelle engoznado |
| Railway | spring-rail frog | corazón con pata de liebre móvil |
