| CTA | Windy City rail system, in brief |
| METROPOLIS | City rail system cut back, I suspected initially |
| GITRACT | Part of the digestive system, in brief |
| HVAC | Climate control system, in brief |
| SLR | Mirror-and-prism system, in brief |
| GAUTRAIN | Commuter rail system in Gauteng, South Africa (8) |
| SBAHN | The urban rail system in Berlin or Munich? (1-4) |
| SUPERTRAM | Light rail system in Sheffield (9) |
| TYNEANDWEAR | The first modern light-rail system in the UK which serves Newcastle and Sunderland (4,3,4) |
| METRO | Light rail system in the North East of England (4, 3, 4. S) |
| ELS | Rail systems in some cities |
| PAS | Some speaker systems, in brief |
| TAXICABOOSE | Hybrid vehicle for use on city rails? |
| SASSARI | City in northern Sardinia with a light rail system and a rail link to Cagliari (7) |
| SOMBRE | Our rail system is in some circumstances cheerless (6) |
| LUAUS | Hawaiian parties in light rail system going around university (5) |
| SUBWAY | Zigzag by vehicle heading north in US rail system (6) |
| RIVAL | One competitor of several in a rail system (5) |
| TRAM | Vehicle in a light rail system |
| WEST | ...light rail system being built in Toronto (5, 4) |
