| Symbol | Meaning |
| An Af Am Anr Afr Amr Anc Afc Amc R C | An area near the train track An area far from the train track An area a middle distance from the train track Residential area near the train track Residential area far from the train track Residential middle distance from the train Commercial area near the train track Commercial area far from the train track Commercial area a middle distance from the train track Residential Commercial |