| since its inception in the 1940 | 3 | temporal |
| in altoona | 2 | location |
| with a minimal staff | 2 | other |
| track → be → operated | 13 |
| track → be → operational | 12 |
| negative | neutral | positive |
| 0.087 | 0.707 | 0.206 |
| Raw frequency | 25 |
| Normalized frequency | 0.358 |
| Modifier score | 0.400 |
| Perplexity | 286.731 |