| Subject | English | Italian |
| transp., met., construct. | frog-point | incrociamento dello scambio |
| transp., met., construct. | frog-point | crociamento dello scambio |
| transp., met., construct. | frog-point | cuore dello scambio |
| transp., met., construct. | frog-point | cuore |
| transp., construct. | movable point frog | cuore mobile |
| transp. | moveable point frog | meccanismo di cuore mobile |
| transp. | moveable point frog | scambio a cuore mobile |
| transp. | moveable point frog | intersezione a cuore mobile |
| transp. | moveable point frog | crociamento a cuore mobile |
| transp., met., construct. | point frog | crociamento dello scambio |
| transp., met., construct. | point frog | cuore dello scambio |
| transp., met., construct. | point frog | incrociamento dello scambio |
| transp., met., construct. | point frog | cuore |